is smoking 10 cigarettes a day bad Drug Facts Top 10 Terrible Things Smoking
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Chan, W

Normally the p53 protein helps cells destroy themselves (suicide) when their DNA becomes damaged (top row)

1 2 "Nominees Announced for the 47th Annual Daytime Emmy Awards" (PDF)
If it looks bad or infected then please see a Doctor

People who breathe in secondhand smoke regularly have higher chances of getting the same diseases as smokers, including lung cancer and heart disease