what is the chemical in tobacco that causes cancer Effects of Smoking, Illustration - Stock Image - C027/6621 Tobacco Addiction Guide: Symptoms, Risks
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Research shows that the patch, gum or lozenges can also be used safely while you are cutting down to quit, but this is best done with the help of your doctor or another health care provider familiar with treating smoking

Smoking is by far the most common cause of COPD

"Quitting smoking will benefit your health": the evolution of clinician messaging to encourage tobacco cessation
National Survey on Drug Use and Health (NSDUH)