I think the first step is to dispel the stoner myth by not being lazy, not being unmotivated and hold ourselves to a higher standard than others. Also be responsible in your usage. Don't go to work high, don't go to school high, don't drive stoned. Become doctors, and lawyers, professors, scientists etc. If there are assholes out there being stupid while smoking and being irresponsible it further propagates the myth that all smokers are that way.

In college there was a girl who was making comments about smoking and how dumb it makes you, she saw me smoking with some of my friends. The next week she found out I was her teacher for the MCAT course. It made her rethink her position.