Since quitting rather abruptly a few weeks back, I have utilized all available forms of nicotine replacement. I started with a month of Zyban before stopping.<br>I then for irrelevant reasons increased my intake of ciggarettes to 3 packs of full strength 100s a day. Shortly I could hardly breathe and was hospitalized and treated for congestive heart failure. I couldn't breathe because my heart couldn't keep my lungs from filling up with liguid. Once being stabilised and released after 7 days, and lots of meds,<br>I have continued not smoking by using the patch as well as nicotine gum and finally nicotine inhalers or e-cigarettes. <br><br>Since I am incredibly addicted to nicotine, I have tried pretty much every e-cig available. <br>Some are so similar to real cigarettes as to be virtually interchangable. <br><br>The problem is that one can dramatically increase one's intake of nicotine without suffering the ill (and to some extent limiting) effects of tobaco.<br><br>Therefore I fear that an even more insideous addition to nicotine than that produced by tobaco is possible.