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The American Cancer Society reports that 90% of people with mouth, lip, throat and tongue cancer are tobacco users

However, if we are willing to accept that smoking causes lung cancer, and is in fact responsible for all or nearly all of the increased risk, then we can use the data we have to answer a related question: if a smoker is diagnosed with lung cancer, what is the probability that it was caused by smoking

Research has shown that the ingredients in e-cigarettes vary widely between manufacturers and often contain chemicals that are associated with negative health effects, such as eye irritation, respiratory infections, and even irreversible lung damage

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