I'm self-employed <a href="http://tucson-appraisers.com/stmap_41cgq8c.html?exelon.ciplox.levitra.sulfasalazine" rel="nofollow">norvasc patent expiration</a>  An e-cigarette is a nicotine inhaler, composed of a rechargeable lithium battery, an atomiser with a small heating element, and a cartridge containing nicotine suspended in a mixture of propylene glycol and water. When you âvapeâ &#8211; the term used for inhaling on an e-cig &#8211; the mixture in the cartridge is heated and a small amount evaporates, delivering nicotine to the user without the tobacco associated with cigarettes. As a result of this clever design e-cigarettes perform essentially the same function as a normal cigarette, but with reportedly one tenth of the toxins compared to burning tobacco. So, what are the draw backs?