You clearly are unaware of the results of many recent studies.
Any way... smoke, shoot, drink... an approved agent is already available by prescription for medicinal use, on and off of the PDR.
Smoke from any vegetable matter... ANY.. is variously carcinogenic even without the additives in commercial cig. tobacco and flavorings. Particulate degeneration and destruction of cilia in the lung tissue is only part of the process of anoxia, and carcinogenesis. The filters— basically a delay of reality on dosing.