Matter of fact I know a 66 year old guy who smoked pot for 30 years but not for the last 10. He has memory problems. No proof pot caused it but .......
I’m surprised you would even try to say that since research says that smoking pot is benefical for those prone to alzheimers?
http://truthalliance.net/Archive/News/tabid/67/ID/1831/Marijuana-may-ward-off-Alzheimers-disease.aspx
Of course that does not mean it can prevent it and at 66 he’s at prime age for those type of problems.
And another:
http://www.scientificamerican.com/blog/post.cfm?id=pot-joins-the-fight-against-alzheim-2008-11-19