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

https://bizzmarkblog.com/is-a-budget-conduction-vaporiser-good-enough-for-medical-use/

UK prescribed medical cannabis is typically vaporised, not smoked, to avoid harmful toxins from combustion. Vaporiser type—conduction or convection—and temperature settings influence the release and effects of cannabinoids