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Do you consider yourself a type A personality — ambitious and impatient? If so, you can thank the tobacco industry for that bit of self-knowledge. For decades, the cigarette companies Philip Morris International and R. J. Reynolds supported and promoted studies linking a driven personality to an increased risk of heart disease. The apparent motivation? To raise questions over smoking as a contributor. Subsequent research by scientists without funding from the tobacco industry did not link type A personalities to higher rates of disease or death.