Many people experiment with drugs out of curiosity, to have a good time, because friends are doing it, or in an effort to improve athletic performance or ease another problem, such as stress, anxiety, or depression. Use doesn’t automatically lead to abuse, and there is no specific level at which drug use moves from casual to problematic. It varies by individual. No matter how often or how little you’re consuming, if your drug use is causing problems in your life—at work, school, home, or in your relationships—you likely have a drug abuse or addiction problem.