is smoking 3 cigarettes a week bad Single cigarette takes 20 minutes off life expectancy, study finds | One cigarette a day 'increases
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![PDF] Effects of smoking on heart rate at rest and during submaximal exercise, heart rate recovery and blood pressure in young adults](https://figures.semanticscholar.org/ee4596c50e727a895beaf93d86df2a7f8e7397a9/4-Figure7-1.png)











