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

https://www.thelondoneconomic.com/lifestyle/health/how-medical-cannabis-vaping-works-temperature-devices-and-the-economics-behind-it-409054/

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