25 million people take Adderall to help them focus. But when used recreationally, the drug can be harmful—even deadly. By the time 36-year-old Scott Hahn caused a fatal crash on the New Jersey Turnpike Feb. 22, he’d taken 10 Adderall pills and been awake for more than a day. The accident took the lives of local teacher Tim O’Donnell and his 5-year-old …