Evidence for a Causal Relationship between Academic Achievement and Cigarette Smoking
Introduction: Academic achievement (AA) is associated with smoking rates. Can we determine the degree to which this relationship is likely a causal one? Methods: We predict smoking in male conscripts (mean age 18.2) assessed from 1984 to 1991 (N = 233 248) and pregnant females (mean age 27.7) receiving prenatal care 1972-1990 (N = 494 995) from AA assessed in all students at 16. Instrumental varia