Why shouldn't it be legalized? If it was your roommate wouldn't be a dealer. Psychological effects are not the fault of cannabis, but the individual user. The lying and cheating is because...IT'S ILLEGAL! Wow, you just described the guy has huge problems, which confirms my point that it was HIS fault, not cannabis, and could have easily happened over alcohol, gambling or many other things. Cannabis can also help treat anxiety and depression, but there's nothing wrong with using it recreationally.