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

https://wiki-velo.win/index.php/Does_My_Vaporiser_Count_as_Part_of_My_Medical_Cannabis_Treatment%3F

UK medical cannabis is typically vaporised, not smoked, to avoid harmful toxins. Vaporiser temperature and device type—conduction vs convection—impact how effectively cannabinoids are delivered