well dont smoke to be cool is my first suggestion. I hate people who go around talking about yeah i smoke only to make it cool. most of the time it should be on the dl so you dont get a pothead reputation and people dont think less of you.
I suggest either smoking a whole blunt to the head(by yourself) or smoke some bowls/bong hits. A blunt should get you high the fist time. Just make sure you smoke until you are high because i know so many people who havnt and they are just curious if they got high so they smoke again and again. Smoke until you get high so you know if you like it or not.