is it okay to smoke one cigarette Even a day greatly raises cardiovascular risk, experts warn | Smoking Light smokers may not escape
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![PDF] Effect of Cigarette Smoking on Heart Rate Variability in Health Adult Smokers in The Age of 20-60 Years](https://figures.semanticscholar.org/67a70218a1ec642b5d38a9635b99c70eff207af5/3-Figure1-1.png)














