I'm trying a little experiment. I found, via another cannabis forum, this patent: http://www.freepatentsonline.com/7344736.html. It describes a process of extracting the goodies from weed - and it includes results of experiments performed to determine how to pre-cook weed in order to decarboxylate the THC-A and CBD-A (found in the raw plant material) to their active forms (THC and CBD). So I wondered what vaping pre-decarboxylated weed would be like, as opposed to decarboxylating on the fly while vaping as per normal. It seems, according to the document, that while it's true that THC technically decarboxylates at 105C, it takes a long time, many hours, to do so. At higher temperatures it'll do it much faster, but you run the risk of degrading the cannabinoids. So I read that cooking your weed for an hour at 120C/250F should decarboxylate 99% of your THC-A and 97% of your CBD-A without causing significant degradation of THC due to heat (less than 2%). So today I cooked up a couple of grams for an hour at this temperature. And now I'm vaping the stuff through my PD. Well, I'm afraid that most of the taste is lost, which is sad, but I'm getting really thick clouds, and they seem to feel even easier on the lungs than normal. I'm not sure if I'm just imagining this, but the high feels a little smoother and more realxed. There seems to be something missing though, and I'm not sure it's something I want back or not. Interesting. Anyway, it's early days yet, as I'm only a couple of stems in. I'll work my way through this roasted weed and I'll switch back to unroasted in a few hours to compare. And I'll report back here of course. Any thoughts?