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In 2012, more than 1 in 5 American teens at least 20 percent used tobacco products, they found

Many people on social media claim that epidemiological research is low quality because they rely on food frequency questionnaires (FFQs) which are questionnaires that ask people questions like, How many eggs did you eat on average last month? How many did you eat last year? How many did you eat in the last three years? Now, the reason why those questions are fraught with error is because most people can't even remember what they ate for breakfast last Friday

The combination of tar sitting on the tooth surface and nicotine absorbing into the enamel creates a two-layer staining effect

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