Nowhere near as bad as a cigarette, No tar or nasty chemicals, just propylene glycol, glycerine, flavourings (all found in foods, and harmless), and for those who want it, nicotine, which is addictive, but not dangerous,. Most e cigs have no smell at all, and if you can smell anything it is likely to be from an e liquid the user has added something to. Basically what users blow out is condensation/steam from the burning process (the battery heats a coil, which turns the liquid into vapour). I can understand why the tobacco industry is so keen to spread stories of e cigs being harmful, or of unknown risk, but they are a huge threat to their business, with millions giving up in favour of e cigs. So they are trying to get legislation passed to either restrict, or ban them. Pretty rich from an industry still peddling a product which is known for sure to have killed countless millions, and which has many of our own politicians either lobbying for them for back-handers, or sitting in their boardrooms.