Vaporizer settings and the temperature of dried flower: why are these two different numbers

What is the difference between the temperature set on the vaporizer and the temperature of the dried flower?

The setting describes the heating element or the airflow, not the material lying in the chamber. The dried flower heats up from what touches it, transfers heat to the inhaled air, and heats unevenly, so its actual temperature is different from the number on the display. There is definitely a difference, but it has not been publicly measured.

Heat reaches the material in two ways: through contact with the heated surface of the chamber or through the air flowing through the bed. In the first case, the hottest part of the dried flower is the one that is in contact with the wall, while the center of the bed lags behind. In the second case, the reading refers to the air entering the chamber, not to what it encounters along the way. Neither of these two readings measures the material itself.

Inhaling changes the picture once again. The inhaled air enters cold, absorbs heat from the bed, and carries it away with the vapor, so during inhalation, the material cools down, and between inhalations, it regains heat. The stronger the airflow, the greater this loss. Therefore, the temperature of the dried flower is not a single value maintained throughout the session, but a fluctuating wave along with the breath of the person inhaling.

The material itself is also not homogeneous: smaller fragments heat up faster than larger ones, and the layer closer to the heat source loses volatile components earlier than the rest. The vaporizer setting does not equal the temperature of the dried flower and cannot be converted with a single correction. We have not found any publicly available measurement that indicates how much these two values diverge with medicinal dried flower; inserting our own number here would be fabrication, not rounding.

Does the number on the display describe the composition of the inhaled vapor?

No. The setting only indicates how strongly the device heats. What evaporates first and in what proportion is determined by the vapor pressure of the individual components at a given temperature, and some of them break down into other substances along the way. Therefore, the composition of the vapor is a derivative of chemistry, not a reading.

The first of the two studies on this topic examined the documentation reaching patients and their caregivers. Eyal and colleagues (Cannabis and Cannabinoid Research, 2023) compared their own material with a literature review and measured the composition of the material after subsequent processing steps (PMID:35442765). In this documentation, they encountered numbers that were simply incorrect and mixed concepts: boiling is sometimes taken for vaporization, vaporization for simple evaporation, and boiling temperatures of cannabinoids are often reported incorrectly.

The rate at which a given component decreases is determined by its vapor pressure compared to the vapor pressures of the others, while the boiling point does not resolve anything here. Loss begins during drying and curing and accelerates during decarboxylation; monoterpenes escape first, so during vaporization, they reach the lungs before cannabinoids. Finished hemp products carry fewer terpenes than the plants from which they were made, and terms like full spectrum are directly called misleading by the authors, as the composition of the plant is not reflected in any of them.

The second study focused on measurement. Zhu and colleagues (Scientific Reports, 2022) heated five monoterpenes within the range encountered in device chambers, then what remained was chromatographically separated after thermal desorption and identified by mass spectrometry (PMID:35773373). From the most stable compound, 97 to 98 percent survived in its original form, while from the most fragile, only 11 to 28 percent. The range between the extremes is nearly ninefold. This is not a share in the profile, but the percentage of molecules that survived; the denominator is the amount submitted for measurement.

The most stable of the five studied turned out to be myrcene, while the most fragile was terpinolene. Oxidation left behind molecules with masses of 134, 150, and 152, among them probably beta-pinene, fenchol, and p-(1-propenyl)-toluene. No one has checked whether inhaling such products harms anyone; however, it has long been known that oxidized monoterpene oils can cause allergies and irritation. Therefore, the reading from the display does not indicate either how hot the material is or what goes into the vapor.

Does a terpene evaporate only at its boiling point?

No. Molecules leave the surface under any conditions, and raising the temperature only accelerates this loss, and very dramatically. Boiling begins only when the vapor presses as hard as the surrounding air; it is a threshold for changing the nature of the phenomenon, not a switch. The entire aim at a single component is based on this misunderstanding.

Water in an open glass disappears at room temperature, even though it is far from boiling. The same applies to plant oils: some molecules leave the surface under any conditions, and the higher the temperature, the faster it happens. Therefore, the material loses its most volatile components already during drying and storage, before anyone reaches for the device.

The conclusion is uncomfortable for tables: since vaporization does not have a threshold for activation, no setting releases a single component separately. There is always a mixture in the vapor, and the proportions in it change during the session because what is most volatile evaporates first. The physics of vaporization itself is broken down in a separate text about the evaporation of terpenes from dried flower.

The boiling points collected in databases describe the behavior of pure substances in a flask, not the behavior of the same molecule trapped in plant tissue, alongside resin and water. These are two different situations, and only the first has a measured number.

Why are terpene temperature tables not comparable?

Because the numbers in them come from measurements made under different conditions, and the most important condition, which is pressure, is often omitted. We checked eleven terpenes from this project in the public PubChem database, and only for six is the boiling point listed along with the pressure at which it was measured. The rest breaks down into three separate states.

The atmospheric records include caryophyllene, limonene, linalool, myrcene, pinene, and terpinolene. Humulene has only a measurement under reduced pressure. Nerolidol and ocimene carry a number without specified pressure, so it cannot be compared with the previous ones. Bisabolol and farnezen do not have a boiling point at all in this database.

Humulene shows the danger of pulling a number out of context. The only record that the database holds for it is a range of 99-100 degrees, but taken under a pressure of three millimeters of mercury. There is practically no air there. The same number placed in a row with readings under normal pressure ceases to be a rounding and becomes a falsehood, as each describes a different physical arrangement.

The table below breaks down eleven names into four states. Only positions from the first row may be compared; the others describe either a different measurement setup or a lack of measurement. A comparison that does not distinguish this appears to be the result of measurement, but is a jumble of records with different meanings. Why popular tables provide different numbers for the same molecule is broken down in a separate text about their comparability..

How long does the effect last after vaporization, and how long after ingestion?

The route of administration determines the course more than the strain itself. Inhalation provides the first sensations within a few minutes and concludes the episode within a few hours, while ingestion delays the onset by several dozen minutes and prolongs the overall experience more than twice. The difference arises from the pathway through which the substance enters the bloodstream.

The route of administration determines the course more than the variety itself. After vaporization, the substance passes from the lungs to the blood almost immediately, so the first sensations appear after a few minutes, the intensity increases for another ten to thirty minutes, and the whole effect lasts for two to four hours. After ingestion, the raw material first passes through the intestine and liver, so the first sensations are awaited from half an hour to two hours, and the episode can last six, sometimes eight hours. Hence the most common mistake with oral administration: anyone who thinks nothing is happening after thirty minutes and takes another dose will receive both doses at once. The above ranges describe the route of administration, not this variety; pharmacokinetic studies for a single cultivar have not been published.

The setting does not shorten or prolong this course. It only changes how much substance can transition to vapor in one session, not how quickly the body absorbs it and how long it will take to eliminate.

What side effects are described with dried flower?

Reports are collected for a medicinal product from a specific batch, not for the device's setting. Heating adds a separate issue: some oxidation products formed in the chamber do not have described inhalation toxicity, so they do not appear in any symptom list. Known symptoms therefore relate to dried flower as a group of raw materials, not the method of its heating.

Reports of adverse effects are collected for medicinal products with a batch number, not for the strain name, so the following pertains to hemp dried flower as a group of raw materials. The most frequently reported symptoms are dry mouth, red eyes, and increased heart rate. Dizziness upon rapid standing, daytime drowsiness, and temporary worsening of short-term memory are less frequently described, as well as anxiety that increases with dosage. A separate issue is medications taken concurrently, especially sedatives and those affecting coagulation: their assessment requires knowledge of the entire list of preparations, not just the description of the plant. We do not provide the frequency of these symptoms numerically, as public compilations for hemp dried flower in Poland do not separate them by individual products.

The vaporizer setting on this list does not change because it was created from reports on products for which no one noted how the device was adjusted. If temperature had its own contribution, today's data collections would not show it.

What has not been studied about the vaporization of terpenes from dried flower?

It has not been studied what happens between the chamber and the blood. Both works from this side describe the behavior of substances outside the body: one compiles data on composition at processing stages, the other measures distribution in the apparatus. None have studied a person inhaling vapor. The evidence base for this axis has not a single study involving humans.

No study has been published that would measure in humans how much terpene from heated dried flower actually reaches the lungs and the blood. It is known in what order components evaporate and what portion decomposes along the way, but it is unknown how much of this reaches the body or whether it has any measurable effect. It has also not been shown that setting the vaporizer to the temperature listed in the table as the boiling point of a specific terpene leads to inhaling that particular terpene.

This gap has a specific consequence for reading tables. Even if someone measured how much cooler the dried flower remains compared to the heating element, they would still not know what portion of the released substance reaches the alveoli and what settles along the way or is exhaled. Without this link, the number on the display does not connect to anything that can be measured in the patient.

What does this imply for the patient?

Above all, it means that the decision on the method of administration is made by the attending physician, and no table from the internet can replace them. The raw material is provided to the patient only by prescription, so this page reports the state of knowledge and does not indicate any value as good. Questions are resolved through conversation with a doctor or pharmacist.

From the above, one cannot derive a single number for everyone. The same raw material in two different chambers will behave differently, and the same chamber will behave differently with a quick versus a slow draw. The compilations circulating online overlook both of these factors, as they provide a single value for the ingredient name and remain silent about the rest of the system.

So what remains useful? The awareness that the setting is a parameter of the device, not a description of what the patient inhales, and that no one has publicly measured the difference between them. The strains currently available in Polish pharmacies are collected in the comparison of currently available strains, while dried industrial hemp sold without a prescription has its own place in the store.

Dried flower is a pharmaceutical raw material dispensed by a doctor's prescription in the Rpw category, and the method and timing of administration are determined by the attending physician. The material is informational in nature and does not replace medical advice or information contained in the medicinal product documentation.

Frequently Asked Questions

Is the vaporizer setting the temperature of the dried flower?

No. The setting describes the heating element or the air entering the chamber, and the dried flower absorbs heat with a delay, cools down when inhaled, and heats unevenly. There is a difference between these two values, but it has not been publicly measured.

How much cooler is the dried flower compared to the setting?

It is unknown. We have not found publicly available measurements of this difference for medicinal dried flower, and the numbers circulating in guides lack a source or method. Providing a specific value here would be fabrication.

Does the terpene start to evaporate only after reaching the boiling point?

No. Evaporation occurs at any temperature, and the boiling point is the moment when the vapor pressure equals the surrounding pressure. The rate of loss of individual components depends on their relative vapor pressure, not the boiling threshold.

Why do temperature comparisons provide conflicting numbers?

Because they mix records of different statuses. In the PubChem database, six out of eleven terpenes in this project have a boiling point with the specified pressure, one only under reduced pressure, two without specified pressure, and two have none at all.

Does heating destroy some of the components of the dried flower?

Yes, to a very varying degree. In laboratory measurements of five monoterpenes, the proportion of the substance that survived heating in an unchanged form ranged from 97 to 98 percent for the most resistant and from 11 to 28 percent for the most unstable.

Who determines the method of consuming the dried flower?

The attending physician. The hemp dried flower is dispensed by prescription from a doctor, and the informational page does not replace their decision. This text describes the state of evidence and does not indicate any value as suitable for everyone.

Editorial text from the editorial team of ubucha.pl. Status as of August 2026.