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5 cigarettes a day really bad Only smoking 2-5 still doubles the risk of heart disease, study finds Light Smoker vs. Heavy Smoker:
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[108] Usage behavior may contribute to variations in the specific metals and amounts of metals found in e-cigarette vapor

Smoking cigarettes can damage the heart, blood vessels, and blood cells

The authors stress that smokers must quit completely to get the full benefits to health and life expectancy

[146] A 2016 WHO report found that acetaldehyde from second-hand vapor was between two and eight times greater compared to background air levels

Cullen KA, Ambrose BK, Gentzke AS, Apelberg BJ, Jamal A, King BA

Flavoring Compounds Dominate Toxic Aldehyde Production during E-Cigarette Vaping