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

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

UK prescribed medical cannabis is vaporised rather than smoked to avoid harmful toxins. The choice between conduction and convection devices, plus precise temperature control, influences how effectively cannabinoids are delivered