UK prescribed medical cannabis is typically vaporised, not 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 typically vaporised, not smoked, to avoid harmful toxins from combustion. Vaporisation methods—conduction or convection—and device temperature influence how cannabinoids are delivered and absorbed