I was used to smoke on a regular basis, but today it is only an electronic cigarette that I use. The batteries that I received with smoke stick did not last for more than a few months. I did not find the customer services kind enough to replace initially. Though I got this replaced and these new batteries have been offering services from last 8 to 9 months. One of the reasons why I love Smoke Stik Cartomizers is these are easy to refill. I would suggest you to buy rubber holes as it will be much easier to hold it between your teeth.