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

https://wiki-saloon.win/index.php/How_Do_I_Explain_to_Family_That_Prescribed_Cannabis_Isn%E2%80%99t_Smoked_in_the_UK%3F

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