A journal published April 12, 2016 at the NCBI, The National Center for Biotechnology Information, gives further credence to the benefits of switching from smoking to vaping. The following paragraph is taken from that article and a direct link is provided below.
Considering that vapour toxicology is by far less problematic than that of conventional cigarettes , that e-vapour products are at least 96 % less harmful compared to combustible cigarettes  and that cigarette smoking carries a heightened risk for respiratory infections and pneumonia [1–4], substantially reducing daily cigarette consumption in smokers by switching to e-vapour products is likely to produce significant health benefits.
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