If pot becomes legal, we're gonna see people use it like cigarettes are used, which means they're gonna be using it around people who don't want to be exposed to it. It does have negative effects, just like anything that's smoked. It's bad enough we have to be around cigarettes so much with all the negative effects they have, I really am against having to be around marijuana all the time too.
You all seem to make it work doing it in secret, it should stay that way. If you're that desperate to be cool or whatever, then be prepared to work for it.