The health promotion literature for young adults is not generalizable to the elderly, and different outcomes are likely to motivate changes in health practices within the two populations. Main and interactive effects of smoking, alcohol consumption, obesity and physical activity on older Canadians' quality of life are examined with 1991 GSS data. Quality of life is operationalized with psychological well-being and subjective health indicators. Two dichotomous outcomes are used for each dimension, where one outcome is relatively sensitive in detecting impaired quality of life and the other relatively specific. Smoking was consistently associated with negative outcomes, but there was little evidence of adverse effects for alcohol consumption. Physical activity effects were most pronounced comparing sedentary and moderately active individuals. Body mass index showed curvilinear associations with impaired quality of life and interactions with smoking and activity level in separate models.
