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The percentage of smokers in the country began to drop in the late 1980s and has been extremely stable ever since, ranging between 22% and 29%

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

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These SUD questions classify people as having an SUD in the past 12 months and are based on criteria specified in the Diagnostic and Statistical Manual of Mental Disorders, 4th edition (DSM-IV)