This is how I deal with E-smoking. First, I live in a VERY liberal, regulated, nanny state county- Montgomery County, MD. No offense to liberals, I'm a lib to, but you get my point. I also work for Health and Human Services(federal). Also go to local community college. My number one tip to avoid trouble is to just not exhale vapor. I can take a huge puff of my 901 and if I hold it in for 10-15 secs, nothing gets exhaled. That helps. In class and work I hold the e-cig in my sleeve, with just the cartridge sticking out and hit it. Whats really cool though is that if you get some trouble, just say its a nicotine inhaler, it tehcnically is! I sometimes just lie and say its a new version of a Nicotrol inhaler because thats pretty well known compared to e-cigs. Love the exhale because it feels like your smoking when vapor comes out but I don't like to push my luck in public places! I'm not fond of dealing with police, thanks to my sportbike riding either.