UK prescribed medical cannabis is taken by vaporisation to avoid harmful toxins...

https://www.thelondoneconomic.com/lifestyle/health/how-medical-cannabis-vaping-works-temperature-devices-and-the-economics-behind-it-409054/

UK prescribed medical cannabis is taken by vaporisation to avoid harmful toxins from smoking. Vaporiser type—conduction or convection—and temperature settings impact drug delivery and effects