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

https://post-wiki.win/index.php/Why_Does_the_UK_System_Treat_Vaping_Equipment_Differently_from_Medicine%3F

UK prescribed medical cannabis is typically vaporised, not smoked, to avoid harmful byproducts from combustion. Vaporiser type—conduction or convection—and temperature settings influence how cannabinoids are delivered and absorbed