Cigarette smoking was determined by asking participants whether they had ever smoked more than 5 packs of cigarettes (100 cigarettes) during their entire life so far and the average number of cigarettes smoked a day. Individuals who never smoked or smoked less than the threshold were coded as never smokers (0; n = 1133, 48%), those who smoked once in awhile, not every day, or less than 10 cigarettes a day were classified as occasional/light smokers (1, n = 427, 18%), and those who smoked more than 10 cigarettes a day were classified as medium/heavy smokers (2, n = 764, 32%). We classified as missing 35 individuals who responded “don’t know, don’t remember” the average number of cigarettes smoked a day during their time as smokers.
