Whether cannabis induced psychosis is real or not, most of the psychiatric profession believes it's real. With the help of these "expert" witnesses a good lawyer should be able to convince a jury that it is real too. Because of this I don't think that recreational cannabis will ever become the province of big business. If it does, then Phillip-Morris and their ilk will be footing the bill for future medical care for every young adult who succumbs to schizophrenia.