UK medical cannabis is prescribed for vaporisation, not smoking, to avoid...

https://wiki-triod.win/index.php/Is_Medical_Cannabis_in_the_UK_Prescription-Only_or_Can_Anyone_Buy_It%3F

UK medical cannabis is prescribed for vaporisation, not smoking, to avoid harmful combustion byproducts. Device type—conduction or convection—and temperature settings impact effectiveness and user experience