I think there are a lot less chemicals in the ecig than regular cigs, and no tar. It's trading one addiction for another in the same way as using the patch or the gum. It's lower levels of nicotine, and it's transitional to quitting. Nicotine on it's own is not that bad for you, it's the chemicals in it and the actual inhaling of smoke that causes the damage. It is definitely better to quit totally than smoke ecigs, but ecigs are harm reduction, which is better than doing nothing and continuing to smoke. IMO anything that makes it easier is worthwhile.

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