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Parental Optimism About Children's Risk of Future Tobacco Use and Excessive Weight Gain. BACKGROUND: Adults tend to underestimate their personal risk of disease, but little is known about parents' perceptions of children's risk. METHODS: In total, 648 parents of children 0 to 18 years old attending 2 pediatric practices were surveyed about their children's exposure to smoking; 344 parents with children ≥2 years old also were asked about their children's sugar-sweetened beverage (SSB) consumption and physical activity. Children were categorized as "at risk" or "not at risk" for each factor. Parents estimated the risk of their child becoming a smoker or gaining excessive weight and were categorized as "optimistic" if they believed their children were less likely than others to use tobacco or gain weight. RESULTS: Overall, 92% of parents thought their children were at lower risk than average for tobacco use, and 86% believed their children were at lower risk for excessive weight gain. A high frequency of optimistic bias occurred even among parents with "at-risk" children, including parents with children exposed to tobacco use (70.4%), SSB consumption (77.6%), >2 hours of screen time (82.1%), and low physical activity (84.1%). In multivariable analyses, parents with children exposed to tobacco smoke (odds ratio = 0.21, 95% confidence interval, 0.09-0.51); or who consumed SSBs daily (odds ratio = 0.44, 95% confidence interval 0.20-0.97) were less likely to be optimistic about their child's future tobacco use and excessive weight gain, respectively. CONCLUSIONS: Most parents believed their children were at lower risk than average for tobacco use or excessive weight gain. Eliciting parents' optimistic biases might facilitate behavior change counseling in pediatric settings.