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This may be due to the build-up of gas in the intestines, or it may be caused by an underlying condition such as irritable bowel syndrome (IBS)

Preventive Medicine Reports

So, can you smoke on a cruise ship

Is Nicotine Bad for You

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These observations about more severe illness in smokers vs people who have never smoked seems to parallel what is seen in respiratory viruses such as respiratory syncytial virus and seasonal influenza, where smokers tend to do worse than non-smokers, said Hays, also mentioning that no data is currently available on people who vape or use e-cigarettes