Some evidence is mounting that heavy pot use among young teens can cause permanent emotional and physical damage. But surveys of teen pot use, however, tend to dispel the theory. The research is complicated, but so far, the numbers are reassuring. Pot use among teenagers has barely changed since 1996, when California broke the medical marijuana ice and became the first state to legalize its use.Ultimately this is a good article that says kids choose intoxicants for many reasons that have little to do with adult laws, so medical marijuana isn’t likely going to boost our adolescent pot use in states like Florida where it’s looking very good to be legal this November. And then we have research saying that legalization doesn’t lead to more crime.