cutting down on how often you smoke, although difficult can greatly affect how high you get. I try to smoke only twice a day (although it usually runs more like 5 times). When I smoke 2 times a day for several days in a row I start to get high every time I smoke, but if I smoke more than that particularly more than 5 times a day, then the following day I cannot get high at all during the first part of the day.. so i try not to smoke in the morning on these days... This seems to be almost as effective as quitting altogether for a week or so. Also quitting for just a day or so or even one day should have a noticeable effect on tolerance.