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

https://gracesbestcolumns.huicopper.com/how-do-i-avoid-getting-stuck-with-the-wrong-vaporiser-for-my-prescription

UK medical cannabis is typically vaporised, not smoked, to avoid harmful toxins and improve safety. Vaporiser type and temperature control influence how effectively its benefits are delivered