I have 19 year old twin sons with Tourette Syndrome, as I dont want them doing any drugs I have seen a tremendous difference in them after I know they have been smoking Marijuana. As you know with Tourette Syndrome there are a variety of "tics" abnormal movements like vocal tics, eye rolling, neck stretching and others. their tics disappear totally after smoking! We have talked about it many times, at first i was skepical but now after seeing them happy and tic free i am a believer.