Those who don't believe in legalizing marijuana have a lot of arguments against. None that are really compelling or even really make a point. But one that seemed to be a legitimate concern was teen usage. If pot was more readily available, you might think it would find it's way into the hands of more and more teens.

Well, that's not the case according to a recent federal study. In fact, marijuana use for kids ages 12 to 17 has gone down for over 20 years. However, both the 18 to 25 and 26 to 34 year old age groups have gone up. But the important number here is the 12 to 17 year olds because that's where there's the biggest concern. And that's because of brain development and the effects on it.

While marijuana does have it's share of risks, it is widely considered better than alcohol, and coincidentally enough, since marijuana has started to become more accepted and legal, alcohol use among adults is down.