The other issue I have seen among heavier cannabis users is a tendency to live in a fantasy world. That said, I think cannabis users may actually be more emotionally expressive than non-users.

I had an East Indian roommate who said conventional wisdom in India was that Cannabis was beneficial to older users-and harmful to younger users. I would like to see that studied--along with just how much harm we see from occaisional/monthly/weekly use vs. chronic/daily use.