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The percentage of the population aged 65 years and over and the percentage of construction and mining workers were positively related to the order of prefectural clusters. To promote implementation of nonsmoking in eating and drinking establishments in prefectures especially in those with larger numbers of elderly people and construction and mining workers, it is important to inform the persons in charge that implementation of nonsmoking does not affect the number of customers. To promote implementation of nonsmoking in eating and drink