These chemicals are tools, no more and no less. They should be investigated with intelligence and caution. Take drugs soberly, if at all. I know a few people who have basically ruined their lives though what I would call "abuse" of drugs including MDMA, LSD, cannabis, and nitrous oxide(!) (as opposed to the more obvious drugs like crystal meth, heroin, and crack.)

That said, I know of a few people who had cancer, and no longer have cancer, and the treatment plan they followed involved copious quantities of a kind of goo or tar made from cannabis plants. Those three items are facts: They had cancer, they no longer have it, they used ganja and not chemo or radiation.

I have no interest in arguing with anyone about this, nor am I attempting to condone or evangelize anything. I offer the above as (admittedly anecdotal) data points for consideration. If you want to know more about this please do your own homework online, no one is hiding this sort of thing from anyone (but themselves.)