A bit of weird pot trivia for you. Go back and watch early three stooges movies and watch how they roll and smoke their "cigarettes". I know people rolled their own cig's back then but watch when they hit it. People do not hold tobacco smoke in like that. Remember, weed was not made illegal until 1937, after the rise of the Stooges.
If Marijuana was illegal purely for the narcotic effect, we would be able to use it for other industries (rope, paper, fuel). The ropes on the Nina, the Pinto, and the Santa Maria were all made from hemp (pot), as were the early drafts of the Declaration of Independence and the Constitution, Jefferson smuggled seeds from France during the revolution. beeterolds is 110% correct.
The same people printing the news papers that decried the evils of Marijuana (a word they invented to describe hemp to confuse people) owned the wood pulp paper mills that were competing with Hemp Paper.
Do the research. Read the Emporer's New Clothes by Jack Herer.