Why do some people experience frequent heartburn when they smoke cigarettes?

Because the nicotine from tobacco relaxes the valve between the esophagus and stomach (lower esophageal sphincter). This can allow stomach acid and juices, the chemicals that break down food in the stomach, to back up into the esophagus, which causes heartburn.

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well say a good goal is to do 150 sit ups in a week! or 90 pull ups a day. even 60 push ups in a month these are all fair goals!