UK prescribed medical cannabis is vaporised, not smoked, to avoid harmful...

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

UK prescribed medical cannabis is vaporised, not smoked, to avoid harmful toxins. Device choice—conduction or convection—and temperature settings influence the effectiveness and safety of treatment