The 2017 Youth Risk Behavior Surveillance System (YRBSS) report highlights key health-risk behaviors among U.S. high school students. It found that 39.2% of high school students texted or emailed while driving, 29.8% reported current alcohol use, and 19.8% reported current marijuana use. Additionally, 14.0% of students had taken prescription pain medicine without a doctor's prescription or differently than instructed. During the 12 months before the survey, 19.0% had been bullied on school property and 7.4% had attempted suicide. Many students engaged in sexual risk behaviors, with 39.5% having ever had sexual intercourse and 9.7% having had intercourse with four or more partners. Among currently sexually active students, 53.8% reported using a condom during their last sexual encounter. Many students also engaged in behaviors associated with chronic diseases, such as cardiovascular disease, cancer, and diabetes. Nationwide, 8.8% of high school students had smoked cigarettes and 13.2% had used an electronic vapor product on at least one day in the 30 days before the survey. Forty-three percent played video or computer games or used a computer for 3 or more hours per day for non-school purposes, and 15.4% had not been physically active for at least 60 minutes on at least one day in the 7 days before the survey. Obesity and overweight rates were 14.8% and 15.6%, respectively. The prevalence of health-risk behaviors varied by sex, race/ethnicity, and sexual minority status, with higher rates among sexual minority students. Long-term trends show that most health-risk behaviors have improved. The report also includes data from 39 states and 21 large urban school districts, highlighting disparities and trends in health-related behaviors among students. The YRBSS is used to monitor health behaviors, assess trends, and inform public health actions to reduce health-risk behaviors and improve health outcomes among youth.The 2017 Youth Risk Behavior Surveillance System (YRBSS) report highlights key health-risk behaviors among U.S. high school students. It found that 39.2% of high school students texted or emailed while driving, 29.8% reported current alcohol use, and 19.8% reported current marijuana use. Additionally, 14.0% of students had taken prescription pain medicine without a doctor's prescription or differently than instructed. During the 12 months before the survey, 19.0% had been bullied on school property and 7.4% had attempted suicide. Many students engaged in sexual risk behaviors, with 39.5% having ever had sexual intercourse and 9.7% having had intercourse with four or more partners. Among currently sexually active students, 53.8% reported using a condom during their last sexual encounter. Many students also engaged in behaviors associated with chronic diseases, such as cardiovascular disease, cancer, and diabetes. Nationwide, 8.8% of high school students had smoked cigarettes and 13.2% had used an electronic vapor product on at least one day in the 30 days before the survey. Forty-three percent played video or computer games or used a computer for 3 or more hours per day for non-school purposes, and 15.4% had not been physically active for at least 60 minutes on at least one day in the 7 days before the survey. Obesity and overweight rates were 14.8% and 15.6%, respectively. The prevalence of health-risk behaviors varied by sex, race/ethnicity, and sexual minority status, with higher rates among sexual minority students. Long-term trends show that most health-risk behaviors have improved. The report also includes data from 39 states and 21 large urban school districts, highlighting disparities and trends in health-related behaviors among students. The YRBSS is used to monitor health behaviors, assess trends, and inform public health actions to reduce health-risk behaviors and improve health outcomes among youth.