what do the different color cigarettes mean question about basic brand cigarette colors : r/Cigarettes Different products from tobacco cigarettes

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A previous cross-sectional study a study in which researchers collect data from many individuals at a single point in time found increased risk of asthma in people using e-cigarettes, while a longitudinal study a study in which researchers repeatedly observe the same individuals or groups over a long period of time indicated a higher risk of new respiratory disease symptoms

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The original smoking consumption questions (and questions from 2022 onwards) asked participants: "How many cigarettes a day do you usually smoke on weekdays?" "How many cigarettes a day do you usually smoke on weekends?" The altered smoking consumption question for 2018 to 2019 asked participants: "How many cigarettes a day do you usually smoke Monday to Sunday?" The respondent is requested to enter a number for each day, or select: don't know for each day prefer not to answer Given the changes and interruptions in the delivery of this question, current smoking consumption estimates cannot be reliably compared from year to year between 2018 and 2021