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The documentary opens with Carrie doing what daughters do - carrying some food over to mom

If researchers can figure out how to identify those people before its too late, they can offer targeted help and give the people most likely to suffer an even better reason not to smoke

As Dr Badave puts it, "Therefore, the broader truth is tobacco is not just a mouth-or-lung problem it affects the entire digestive system from the stomach to the liver and pancreas." Acidity after smoking is often treated as a small annoyance

Smokers are much more likely to develop squamous cell carcinoma (SSC) - the second most common type of skin cancer - caused by the uncontrolled growth of abnormal squamous cells in the outermost layer of the skin