Smoking Cessation

What the evidence says

Stopping smoking benefits health at any age. Large cohorts estimate that continuing smokers lose about a decade of life and that quitting around ages 60, 50, 40, or 30 recovers roughly 3, 6, 9, or 10 years, respectively. These are observational population estimates, not guarantees for an individual.^[2][3][1]

The Lung Health Study provides rare randomized mortality evidence. An intensive cessation intervention increased sustained quitting and reduced 14.5-year mortality compared with usual care in middle-aged smokers with asymptomatic airway obstruction.^[4]

For nonpregnant adults, behavioral support combined with an approved medicine—nicotine replacement, varenicline, or sustained-release bupropion—generally produces better quit rates than minimal support. Combining a nicotine patch with a fast-acting nicotine-replacement form outperforms one form alone.^[5][6]

Updated Cochrane evidence finds regulated nicotine e-cigarettes produce higher six-month quit rates than nicotine replacement. This is newer than the USPSTF's 2021 insufficient-evidence conclusion, but long-term safety, product variability, continued dual use, and applicability outside regulated trial products remain important uncertainties.^[7][5]

Cravings, irritability, mood changes, appetite increase, and weight gain are common during withdrawal. A meta-analysis estimated mean gain of about 4.7 kg at 12 months with wide variation; this does not approach the health risk of continued smoking, and a lapse is not proof that treatment has failed.^[8][1]