I think it can make you popular in the sense that it can bring people who might not normally hang out together like it did with you and the guy in your class. Think about it this way, when you find out someone smokes you think oh thats cool, because you have something in common. We're attracted to people we have things in common with. Pot might make you more popular to other people who smoke, but it could make you less popular with people who dont. As long as you dont smoke because you think it will make you popular than its all good.