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Description
The Science Behind Using E-Cigarettes to Stop Smoking Research has consistently shown that the most successful quit attempts involve addressing both the physiological and psychological aspects of nicotine addiction

40% alc./vol

A study in human embryonic stem cells also showed dysregulation of gene expression indicating a negative effect of e-cigarette use on heart development
From damaging lung airways and tissues to causing chronic pulmonary diseases, inhaling toxic substances like tar reduces lung function

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doi: 10.1161/CIR.0000000000000696