I understand where Jack is coming from. The same thing happens with painkillers. When you are in a lot of pain they get rid of it, but if you aren't in a lot of pain they get you high and silly. For anyone who is not in pain there is absolutely no reason you shouldn't be getting high from marijuana. Obviously tolerance goes up, but switching strains really slows that down. I believe anyone who isn't in pain could smoke marijuana every day of their lives and get just as high as the day before.