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Switching does not reduce MI risk

The reason is that the risk of current e-cig use is combined with the risk of being a former smoker, so the net effect is total risk is slightly higher than continuing to smoke.  The odds ratios in the study are all with respect to never smokers who never used e-cigarettes.

You can see the numbers worked out in the full paper, which has noww been published.  It is available here:  Association Between Electronic Cigarette Use and Myocardial Infarction.Alzahrani T, Pena I, Temesgen N, Glantz SA.  Am J Prev Med. 2018 Aug 17. pii: S0749-3797(18)31871-3. doi: 10.1016/j.amepre.2018.05.004. [Epub ahead of print]

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