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A total of 443 patients with Parkinson's disease and a similar number of age and sex matched controls were interviewed as regards their smoking habits. A lower proportion of the patients (26.4%) had smoked when compared with the controls (32.7%). Similarly, the patients had more often stopped smoking (76.1%) than the controls (53.8%). The difference in the proportions of persons who smoked in these two groups may be explained by selective mortality, or alternatively, by premorbid behavior of Parkinson's disease patients.
Marttila et al. (Thu,) studied this question.
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