A study released by the American Medical Association is getting a whole lot of attention this week, as it rightly should. This study, which shows that people who smoke marijuana exhibit little to no harmful pulmonary effects from their use, pokes a gigantic, gaping hole in one of the most often-employed attacks against marijuana reform. According to the 20-year study, those who used marijuana occasionally (2-3 times a month) did not show any decrease in lung functioning and, in some cases, actually…