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

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

UK medical cannabis is often vaporised rather than smoked to avoid harmful toxins. Vaporisation methods vary by device type—with conduction heating directly contacting the herb and convection using hot air—affecting cannabinoid release