rapid heartbeat after smoking cigarette affects the heart long before symptoms appear. Each delivers chemicals that enter the bloodstream within seconds, reaching the heart and blood vessels almost immediately. These substances damage the inner lining Cardiovascular Toxicity of Nicotine: Implications
Description
In 2010, 300 smokers who expressed no desire to quit smoking agreed to try e-cigarettes

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The second surprise was that they weren't for human consumption

PMCID: PMC8589069