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Most studies were observational ( n = 352), using cross-sectional (207), longitudinal (97), cohort (47) or casecontrol (1) designs

Matthew Nuesse, DC, Certified Medical & DOT Examiner Dr

Method #4

The laws are not just reducing the behavior of individuals, Friedman said, but they are reducing the behavior of friends, and that creates a feedback loop, because what your friends do affects you, especially as a young adult. Researchers also looked at changes in smoking among 21- and 22-year-olds who would not have been affected by the tobacco-21 laws, but would have been influenced by other local factors like cigarette taxes, community attitudes toward smoking, and tobacco advertising