It sounds like your friends don't smoke. And that's how a lot of those kind of people act. you seem to me that your in highschool still too, although I don't really know. I remember back in high school I was at a party where everyone was drinking. I didn't feel like drinking so I got high. I entered the room and everyone treated me like an alien. a girl was like "So Chris, how are YOU feeling?" I was pissed that she was being so immature. People acted like they were better than me.

Point is, you either need to stop smoking around these people or find new friends.