I smoked tobacco cigarettes for 25 years. I tried quitting a number of times with no success whatsoever. In fact, of the methods used which included NRT gum, NRT patches, Zyban, hypnosis and cold turkey; cold turkey lasted the longest – and that was ~2.5 days. One day while picking up my weekly carton of cigarettes (I was a 1.5 pack per day smoker), I saw the store was selling an electronic cigarette. I decided to pick up one of these kits plus a couple of packs of my usual cigarettes since I doubted it would do anything; but I like gadgets and I could always stop and pick up a carton of cigarettes when this ‘gadget’ lost its appeal. Well, over the following few weeks the gadget did not lose its appeal. I went from ~30 tobacco cigarettes/day to around 6-8/day. Over these few weeks I went online and found more information about electronic cigarettes. I found that while most people are first introduced to electronic cigarettes by ones that look like a traditional tobacco cigarette, these type of electronic cigarettes (ecigs) are not enough to help some switch completely away from tobacco cigarettes. I purchased another type online and set a quit date for smoking. Prior to using ecigs, the longest I had gone without smoking and not felt the effects of withdrawl was around three hours. When my quit date for smoking tobacco cigarettes came; I lasted about 24 hours before I had one of my wife’s cigarettes. That, however, was my last tobacco cigarette. That was also over 2 years ago – March 8, 2011. Initially I was vaping (ecigs produce a vopor, not smoke, hence ‘vaping’ instead of smoking) at a nicotine level of 18 mg/mL. About 9 months into vaping (I had no intention of stopping vaping or lowering the nicotine content of my ecig liquid), I started getting headaches and feeling nauseous in the evening – I would get a similar feeling when smoking a large number of cigarettes in a short time. So I figured I was getting too much nicotine. Since I was mixing my own ecig liquid at this point – with USP propylene glycol, USP glycerine, nicotine solution and flavoring – I just mixed up some liquid with 12 mg/mL nicotine and these symptoms stopped. Within another 6 months the headaches and nausea reappeared; I decreased the nicotine content of my liquid to 6 mg/mL, which I am using today.