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Although different studies place a different emphasis on which of the reasons that people begin smoking is most to blame, most agree on four main causes: a lack of increase in the cost of cigarettes, the positive imagery associated with smoking, beginning smoking as a child, and the belief that benefits outweigh the risks

They found that many people discard their cigarette butts on the ground even when ashtrays are available nearby

Assessing the suitability of summary data for two-sample Mendelian randomization analyses using MR-Egger regression: the role of the I2 statistic

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