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

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

UK prescribed medical cannabis is usually vaporised rather than smoked to avoid harmful toxins. The choice of device—conduction or convection—and temperature settings impact potency and user experience