Putting out a cigarette

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Commit to Quitting Smoking
If you're a smoker, here's another good reason to quit. Smoking inhibits the production of saliva, which is alkaline and helps neutralize stomach acid. Smoking also causes the muscle between the esophagus and the stomach (lower esophagus sphincter or LES) to relax, which allows stomach acid to rise back into the esophagus—causing heartburn. (Check out this advice on breaking bad habits.)