On an individual level, I find them nearly as obnoxious as normal cigarettes even without tobacco in them and someone is just smoking "perfume" around (why bother at that point?). I have allergy sensitivities to aerosols and perfumes and strong smells and just about any smoking tends to infuriate me.

I see so many people use e-cigarettes as an excuse to smoke indoors, even in light of public smoking bans, and get upset when I complain that they make me feel sick. Indoor air quality isn't just about carcinogens or aerosolized tobacco, but allergens and respect for common spaces that we all have to share.