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

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

UK prescribed medical cannabis is vaporised rather than smoked to avoid harmful toxins. The effectiveness varies with device type—conduction heats directly, convection uses hot air—and temperature controls dosage and flavour