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

https://ameliasultimatecolumn.cloudhinter.com/posts/what-s-the-simplest-explanation-of-vaporisation-vs-combustion

UK medical cannabis is typically vaporised, not smoked, to avoid harmful toxins from combustion. Device type (conduction vs convection) and temperature settings influence how effectively cannabinoids are absorbed