Here's an idea: Do a study to where there are a few decent sized groups of participants of similar heights and BMI's, who are put on a identical exercise program and diet over an extended period of time. Make sure 1 group is drug-free, one group smokes maybe a joint a week, one group that smokes a joint a day, and one group that smokes multiple joints a day. Measure the average improvement of each group of participants over the weeks on the same program. brown townyze the results. Boom.