I've never had anybody tell me that "weed's changed me". I do occasionally get somebody feeding me this anti-smoking bullshit, and I quickly shut that down by either not talking to them anymore, or by making it obvious how much of a fuck I don't give about what they're saying.

Most of my friends that don't smoke are stoners, ex-stoners, and/or do other drugs, so they have no room to talk. My family, and co-workers are really the only people I associate with that I'm not open about my marijuana use to.