Herb Vaporization: Which Herbs, What Temperatures, and How to Start Safely

Vaporization involves heating dried plant material so that volatile compounds evaporate without igniting the material. It sounds simple, and around this practice has grown a layer of numbers that look like research results but are not. A reduction of harmful compounds by over 95 percent, bioavailability of 30 to 60 percent, temperature to the exact degree for each herb. We checked them in the works to which these descriptions refer. Some turned out to be attributed to the wrong publication, some have no source at all, and what was actually measured is more interesting than the common version. Below you will find verified data on the recovery of substances from the vaporizer, an honest answer about what is unknown about temperatures, a separate section on lemon balm, and practical tips for the first sessions.

KEY INFORMATION
• Vaporization resulted in a THC concentration in the blood similar to smoking, with less carbon monoxide in the exhaled air (Abrams et al., 2007, 18 people).
• In one study (18 people), calming after lemon balm was shown for oral extract, not for vapor (Kennedy et al., 2004).
• We have not found a measurement of vaporization temperatures for individual herbs.
• Do not vaporize during pregnancy and breastfeeding; if you have lung diseases and are on regular medication, consult your doctor first.

How does vaporization differ from smoking?

By temperature and what is produced along the way. A vaporizer keeps the material below the ignition point. Volatile compounds evaporate instead of breaking down in flames. When smoking, the ember is much hotter, and alongside active substances, combustion products are formed: carbon monoxide, aldehydes, and particulate matter.

Both methods were compared in a hospital study on 18 healthy volunteers. For six days, they received cannabis of one of three strengths, once through the Volcano vaporizer, once as a cigarette. The THC concentration in the blood was similar in both routes, also in total over six hours. After vaporization, there was less carbon monoxide in the exhaled air. No adverse effects were recorded (Abrams et al., Clinical Pharmacology and Therapeutics, 2007).

Another measurement concerned the composition of the vapor itself. In the vapor from the Volcano, besides cannabinoids, traces of three other compounds were detected, while in smoke, over 111 (Gieringer et al., Journal of Cannabis Therapeutics, 2004). This is also a study on cannabis, not on herbs.

It is worth knowing what is not in Abrams’ work because the internet attributes two things to it. The authors did not state how much carbon monoxide decreased. They also did not measure benzopyrene. The number “over 95 percent” that is repeated everywhere and the statement about the removal of benzopyrenes do not come from this study. The direction of the conclusion does not change: less carbon monoxide with a similar THC concentration in the blood.

For aromatic herbs, we have not found such a comparison. It is reasonable to assume that the mechanism works the same way because the physics of evaporation and combustion is the same. However, this is a conclusion by analogy, not a measured result.

How much CBD from vapor reaches the blood is unknown. A review of 24 works on the fate of CBD in the body provides absolute bioavailability only for smoking: 31 percent (Millar et al., Frontiers in Pharmacology, 2018). For vaporization, none of these works provide it. The circulating descriptions of 30-60 percent have no backing in this work or in others we found.

Which herbs are suitable for vaporization?

Those that contain volatile essential oils and can be well dried. Then they evenly release vapor. Below are five popular aromatic herbs. The table intentionally does not provide temperatures. For none of these herbs have we found their measurements, and the numbers from tables online do not indicate a source.

Lemon balm deserves a separate mention because product descriptions talk about it inaccurately. Calming was shown for the extract taken orally. In a double-blind study, each of the 18 volunteers received on different days 300 milligrams, 600 milligrams of extract, and placebo. After 600 milligrams, the mood after stress in the laboratory worsened less. Participants rated themselves as calmer and less alert. After 300 milligrams, they counted faster (Kennedy et al., Psychosomatic Medicine, 2004). Participants did not inhale anything. We have not found studies on vapor from lemon balm in a vaporizer.

Dried herbs can be found in the herbs category. Before vaporization, check the composition on the packaging. Herbal teas with flavoring or pieces of fruit are not intended for heating in the chamber. Choose herbs with the full name of the plant and an expiration date on the label: then you know what you are inhaling. If the manufacturer provides a recommended temperature, treat it as a starting point. There are no studies on mixtures of herbs inhaled, so promises of synergy remain the manufacturer’s promises.

How to vaporize lemon balm and what effects does it have?

Start from the lower part of the device’s range. Grind the dry leaf not too finely, fill the chamber loosely, and inhale slowly. That’s all about practice. The honest answer about effects is different. Calming was shown for the swallowed extract. For vapor from lemon balm in a vaporizer, we have not found any measurements, so the promises from product descriptions are conclusions by analogy.

We do not provide a specific number of degrees for lemon balm because we have not found its measurement. If the herb manufacturer provides a temperature, stick to it. If not, start low and increase by a few degrees between sessions. The vapor should be visible and cool. The smell of burning or a scratchy throat means the setting is too high, not that the material is weak.

Grinding is more important here than with cannabis. The leaf of the herb breaks down finely, so crush it coarsely and check the screen after the first session. Do not pack the chamber tightly. How much material to fit is provided in your device’s instructions.

The calming effect was measured after swallowing 600 milligrams of extract (Kennedy et al., 2004), and vaporization does not recreate either that dose or that route of administration.

What temperature to set and which vaporizer to choose?

Start with the temperature provided by the herb manufacturer or from the lower part of the device’s range. Then gradually increase it between sessions. The vapor should be visible but cool; smoke or the smell of burning means the setting is too high. For herbs other than cannabis, we have not found measurements of these values. What has been studied for individual compounds is collected in the text about vaporization temperatures of herbs and cannabis.

A vaporizer for herbs with temperature control is suitable for herbs. Convection heats the load with hot air, conduction by contact with the chamber wall. With conduction, the material needs to be stirred during the session. None of these constructions is inherently safer. The purchase criteria are collected in a guide on how to choose a vaporizer for herbs, and the equipment itself is in the vaporizers category.

The temperature control is justified by measurement, although done on cannabis. In a laboratory test, four electric vaporizers set to 210 degrees delivered 54.6-82.7 percent THC and 51.4-70.0 percent CBD to the vapor. A fifth device, gas-powered and without temperature control, delivered 45.9 percent CBD. The authors noted signs of combustion: ash and visible smoke (Lanz et al., PLoS ONE, 2016). The study compared specific models, not heating methods, so the convection vs conduction dispute is not resolved.

How to start herb vaporization step by step?

The whole procedure consists of five steps: grind, fill, heat, inhale slowly, clean. The first session should be short and at a low temperature. Comfort is determined more by the inhalation method than by the device setting. Do it with one herb, not a mixture. If something does not work for you, you will know what to set aside.

Prepare the herbs dry and evenly ground. Too fine a grind restricts airflow and can clog the screen. Too coarse reduces the surface area that hot air washes over. Moist material vaporizes poorly because some energy goes to evaporating water. Moisture, grinding, and the amount of material are discussed more broadly in a guide on preparing material for the vaporizer.

Store herbs in a sealed jar, in a dry and dark place. Grind them just before the session, not in advance. Throw away herbs with mold or a musty smell, as such material should not be vaporized at all.

Fill the chamber loosely and level the surface without packing. Tightly packed material blocks airflow and spoils the vapor. Then turn on the device and wait for the readiness signal. Inhaling before reaching the set temperature only gives cool air.

Inhale slowly and evenly for a few seconds. A sudden pull cools the air in the chamber and lowers extraction. At higher settings, it additionally irritates the throat. Burning or coughing means it is worth lowering the temperature.

Record the herb, the setting, and how you felt after the session. After a few sessions, you will see what works for you, and you will not have to guess again.

After the session, empty the chamber while the device is warm, as residues come off more easily then. Clean metal and glass parts with isopropyl alcohol, and the mouthpiece with warm soapy water, unless the instructions say otherwise. Regular cleaning improves taste and extends the life of screens.

When not to vaporize?

Do not vaporize during pregnancy and breastfeeding; if you have lung diseases and are on regular medication, consult your doctor first. Vapor without combustion products is still a hot aerosol that reaches the lungs. We have not found studies on long-term inhalation of vapor from herbs in a vaporizer.

With asthma, chronic obstructive pulmonary disease, or active bronchitis, the decision should be made by a pulmonologist. The absence of combustion products does not mean that vapor will not irritate the airways, especially at higher settings.

The data on lungs that we found concern cannabis and are weak. In an online survey of 6,883 cannabis users, 152 vaporizing individuals had about a 60 percent lower chance of reporting respiratory symptoms (Earleywine and Barnwell, Harm Reduction Journal, 2007). This is a correlation from self-reports, not proof. A small pilot study without a control group, with 12 individuals in the analysis, showed fewer symptoms after a month of vaporization (Van Dam and Earleywine, 2010). For herbs, we have not found such data.

During pregnancy and breastfeeding, the answer is simpler, as there is a lack of data. It is unknown how many terpenes from vapor cross the placenta or into milk. Therefore, there is no basis to consider such exposure safe.

If you are on regular medication, consult your doctor or pharmacist. This applies to both cannabis and herbs. Interactions of vapor from herbs with medications have not been described in the studies we found, so they cannot be ruled out.

Vaporize only dried herbs of known origin, without additives. Do not add essential oils to the chamber. A vaporizer for herbs is made for plant material, and we have not found studies on inhaling vapor from oils with such a device. Smoking products are often confused with vaporization material. We write more about them in the text on whether herbal cigarettes are safe.

Frequently asked questions

Is vaporization healthier than smoking?

In terms of combustion products, yes. In 18 volunteers, vaporization resulted in a similar THC concentration in the blood as smoking. There was less carbon monoxide in the exhaled air, and no adverse effects were noted (Abrams et al., 2007). This does not mean that hot vapor is harmless to the lungs.

Where does the 95 percent reduction in harmful compounds come from?

Not from Abrams’ study, to which it is attributed. This work states that there was less carbon monoxide after vaporization. However, it does not provide a percentage and does not measure benzopyrene. The number was added outside the literature, and today it is repeated in many product descriptions.

Which herbs can be vaporized?

Dried aromatic herbs, such as lavender, lemon balm, chamomile, peppermint, or sage. We have not found studies on vapor from these herbs in a vaporizer. Sage contains thujone. The public position of HMPC at EMA regarding thujone considers it harmful in large doses, and the HMPC monograph on sage leaf does not recommend it during pregnancy and breastfeeding. Both documents concern oral and topical use, not inhalation. Vaporize only material of known origin, without additives.

Can herbs be vaporized together with cannabis?

Technically yes, but we have not found a study that examined what from such a mixture passes into the vapor and how it works. To start, vaporize them separately. Then you know what works for you and what does not.

How much active substance gets from the herb to the vapor?

The measurement we found concerns only cannabis. In a laboratory test, four electric vaporizers set to 210 degrees delivered 51.4-70.0 percent CBD and 54.6-82.7 percent THC (Lanz et al., 2016). They converted THCA to THC in at least 97 percent. The result depended on the model of the device.

What temperature should I set to start?

For herbs other than cannabis, we have not found a measurement. Start with the temperature provided by the herb manufacturer. If there is none, start from the lower part of the device’s range. Increase it by a few degrees between sessions. The vapor should be visible and cool. Smoke or the smell of burning means the setting is too high.

Do lemon balm and lavender in a vaporizer have a calming effect?

This is unknown. In a 2004 study, each of the 18 volunteers took orally, on different days, 300 milligrams and 600 milligrams of lemon balm extract and placebo. After 600 milligrams, they rated themselves as calmer after stress in the laboratory (Kennedy et al., 2004). We have not found any studies for lemon balm and lavender given as vapor from the herb in a vaporizer.

How often should I clean the vaporizer?

Empty the chamber after each session while the device is warm. Clean more thoroughly every few sessions, more often with cannabis, as it leaves more resin. The cleaning agent and method are provided in the device’s instructions. Regularity improves taste and extends the life of screens and seals.

This article is for informational and educational purposes and does not replace consultation with a doctor. If you are pregnant, breastfeeding, taking medications, or have chronic conditions, discuss the use of supplements or herbs with a specialist.

Author: Michał Waluk · Published: 2026-06-22 · Updated: 2026-10-27