I see people say this, and I disagree. And just for clarity, I'm definitely pro-drug legalisation - even of drugs I never want to be in the same room with.
I think drug companies are precisely the sort of place to produce medical-grade LSD (and other therapudic "recreational" drugs) that has predictable dosages. Same goes for cannabinoids in pill form - especially the sorts meant for folks that would rather skip the high. Someone will need to supply mental health & addiction centers with this. And I think the sale of which will be basically on-par with at least generic anti-depressants. It won't replace anti-depressants or anti-anxiety meds, however. While some folks find improvements in such treatments, it can also make the symptoms worse. It isn't a cure-all, but rather an important alternative and/or addition to current drug treatments. Of course, this is all assuming folks have a clinical setting and that "big pharma" enters this section of the market.
This isn't saying that the war on drugs isn't something about money, but I highly doubt it is big pharma. In fact, considering some of the horror stories about medical treatment in prisons, it might actually be a positive for them even if they don't enter the market as those folks would theoretically get "normal" medical treatment. In contrast, private and public prisons have a huge network of suppliers. Companies and the government hire inmates to do work at very low labor costs. These folks have much more to lose from the end of the drug war.