I used to smoke a shit load of weed and had a really high tolerance. Then, for various reasons(no, I wasn't in jail) I stopped for like 5 years. That, plus the fact that I can now get really, really high quality bud and now I get so fucking stoned from one or two hits. I'm a total lightweight and its so awesome I know it's tough but I definitely recommend taking an extended break to anyone. Maybe 5 years is a bit extreme but I'm sure a month or so might do the trick.