I dont know why I never saw this thread before but Im completely in support of decriminalization and regulation. If there is a system in place to regulate the sale, and take the money away from serious offenders of other drugs not just MJ then im all for it.
As far as short term memory, MJ really does effect you more than you will know. Already at 20 ive noticed that im not as sharp as I used to be. I have many friends that are huge potheads and Marijuana really does effect you down the road. One of the many reasons ive cut down on such use.
As Artemis said some people can live normal lives, but its when pot becomes apart of all activities in ones life when it becomes a problem. As the saying goes, if every story you tell begins with, "This one time I was high and..." you are a pothead.
"Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us."