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Excerpts from The Health Consequences of Involuntary Exposure to Tobacco Smoke: A Report of the Surgeon General

But the study did not report data on how many participants used both e-cigarettes and the Stop Smoking Services including nicotine replacement therapy, leaving unanswered questions of whether the addition of evidence-based cessation treatments were more or less effective in curtailing smoking than just e-cigarettes alone

I agree reducing smoking is more important

The effect of smoking, smoking cessation, and passive smoke exposure on common laboratory values in clinical settings: a review of the evidence