Written in response to an article in today's LA Times ~~>[link]
There have not been enough controlled studies of marijuana to make definitive claims about its harmful effects. The study, that you (the LATimes) report, cites evidence of tissue-loss in areas of the brain that, among other things, play a role in learning and memory. However, there is no mention of test results showing that memory-loss had, in fact, occurred. Without better information, reports chronicling the overall effects of marijuana can, at best, only suggest the possibility of harmful effects. Because marijuana is still classified as a controlled substance, it is not approved for medical research. As a result, there is still going to be a lot more smoke out there than science.