UK prescribed medical cannabis is usually vaporised rather than smoked to avoid...

https://web-wiki.win/index.php/Is_Convection_Worth_It_If_I_Use_My_Medical_Cannabis_Several_Times_a_Day%3F

UK prescribed medical cannabis is usually vaporised rather than smoked to avoid harmful toxins. The choice of device—conduction or convection—and temperature settings impact potency and user experience