Devices & evidence
Dry herb vaporisers: what patients should know
How they work, how devices are regulated, and why vaporisation is not risk-free.
Published 9 November 2026 · Sources checked 9 November 2026
Heating is different from burning
A dry herb vaporiser heats plant material to produce an inhaled aerosol. It is different from a prefilled cartridge. The route prescribed for a patient and the instructions for a particular device matter; this is not a guide to selecting a device or changing treatment.
Regulation does not mean a blanket endorsement
Medicinal cannabis vaping devices are regulated as medical devices. Australian regulatory requirements depend on the device and supply pathway. The TGA’s device guidance does not mean every vaporiser is approved or suitable for every patient.
What does research show about impairment?
A 2018 randomised crossover trial in 17 adults who used cannabis infrequently found that vaporisation could produce higher blood THC concentrations and greater drug effects than smoking equivalent THC doses. Cognitive and psychomotor impairment occurred. A small, short-term experiment cannot establish long-term safety or predict every prescribed patient’s response.
What the evidence does not establish
Avoiding combustion does not make an inhaled medicine harmless. This article makes no claim of a proven reduction in cancer, cardiovascular disease or long-term lung disease. The TGA overview is based on guidance developed in 2017, despite a February 2025 webpage update. Discuss adverse effects and the prescribed route with your treating clinician; do not adjust dosing or device settings based on this article.
Sources and evidence dates
- TGA — guidance overview
Underlying guidance developed in 2017; webpage updated 3 February 2025.
- TGA — medicinal cannabis vaping devices
Updated 7 July 2026.
- Spindle et al., JAMA Network Open — primary crossover trial
Published 2018; doi:10.1001/jamanetworkopen.2018.4841. Older evidence, not a new 2026 trial.
General information, not individual medical or legal advice. No medicine or device is recommended. Source dates are shown separately from this article’s publication date.