If you've ever had to live next to a pothead, all the cute Cheech and Chong stereotypes go right out the window. Mucho pot use makes people paranoid and yes, does give a guy boobies.
Not only that, despite claims, by potheads themselves, that it is not addictive, I know several people who have been smoking it since their teens, and cannot stop. They are in their early thirties now, and live the same lifestyle as they did then. They have zero motivatoins, cannot go a few hours without smoking it, are lazy, they get irritable when they don't have it - but no! Marijuana has no long term effects!! At least according to potheads. Doesn't much matter that it burns at a much higher temperature than cigarettes. The bottom line is, most of the potheads I know are boring losers anyway.
And don't forget that it makes white women want to have sex with negro jazz musicians.