It is the exact contrary. Problems exist with marijuana because it is illegal. It would never have been illegal, we would not even talk about it, and many people would be more healthy, and corruption would be less severe, and probably Obama would never been able to sign the NDAA bill. Prohibition of marijuana has been the trojan horse for "Al Capone" to get the power.keep it illegal! if it becomes legal we will have a lot of problems and people especially kids will get addcited to it too!
If legal, we can explain to the kids that it is a bad idea to mix tobacco in cannabis joint, and this would solve the addiction problem.
There are just no reason at all to make marijuana illegal, except the greedy criminal reason like making it expensive and selling it to the kids. If legal and regulated, the product becomes only a banal but excellent medication. In The Netherlands, where pot is tolerated, the youth doesn't smoke it, because it is not well seen, as opposed to any other country. It is banal, and it would look too much as a stupid trick to look like an adult. The prohibition of a drug is what makes that drug dangerous, only.