Teenagers who smoke or have been diagnosed with Attention-Deficit Hyperactivity Disorder (ADHD) are more likely to drop out of school. Researchers from the University of California, Davis studied 29,662 people asking them about their mental health as teenagers, whether they took drugs, smoked or drank when they were at school and whether they had dropped out of high school. The study found that 28.6% of the students with ADHD had dropped out compared to 26.6% with mania and 24.9% with a mood disorder. However, smoking was even worse with 29% of students who smoked dropping out of school. Using drugs and drinking increased dropout rates but only if pupils smoked as well; once smoking was taken into account drink and drugs had no effect on dropout rates.
You can find out more about this research by clicking on the link in the title of this post.