Yes, cannabis messes with your short term memory, but it apparently prevents amyloid plaque which is a part of what gives a person Alzheimer's. Here is a news article about that-

Europe: Study: Marijuana Slows Alzheimer's Decline

I'm almost 60 and Alzheimer's scares the hell out of me. It's more than nice that my migraine medicine will help keep my wits about me as I get older! You kids don't need cannabis for preventing Alzheimer's, but your grandparents might like to know about it. Type up an envelope and send it anonymously?

Also cannabis does NOT damage your brain:thumbsup:-

Imaging technique sheds new light on the composition of the brain of moderate cannabis users

Or your memory after 1 week of being straight (although the guys doing the research did the (almost government-required to get more money) cop-out in the last sentence. I can't blame them- it's good to get money!)-

Frequent Cannabis Use Not Associated With Cognitive Declines In Working Memory, Selective Attention - NORML

And if your use is less than 5 joints a week (or you can convince your parents that it is that low), this one on IQ is a trip! -

Current and former marijuana use: preliminary findings of a longitudinal study of effects on IQ in young adults -- Fried et al. 166 (7): 887 -- Canadian Medical Association Journal

These are good articles to have printed up for when your parents give you the "It can damage your brain!" BS. Cannabis is the safest drug that I know of- and that includes aspirin! - Granny:hippy: