"Although tolerance has been shown in laboratory animals, this effect is less clear in humans. In fact, there are many reports of a reverse tolerance. In other words, chronic users may be more sensitive to the effects of THC rather than less sensitive. Research results are not conclusive, but generally, tolerance does not seem to occur."

http://www.madsci.org/posts/archives...0410.Ns.r.html
Markass Reviewed by Markass on . "tolerance"---NO SUCH THING i have been seeing more and more posts about this...so i thought i would clear some things up...first of all there is no such thing as smoking "tolerance." Research has shown that the more thc your body takes in decreases your "tolerance"(in fact it is wrong to even use this word) the truth is, the more herb you consume, the better your body becomes at dissolving thc into the bloodstream. so taking a break will not work to reduce the amount needed: smoking more will!!!!...exercise helps get the Rating: 5