Often life can get the best of you, and you may feel that alcohol, drugs, food are the only answer. This can lead to an addiction. And we can become addicted to certain activities too, like videogames, gambling and other. Substance use disorders are complex problems, they often happen to people with anxiety, mood disorders, ADHD. People develop compulsive behaviors that begin to control their lives. Addictions often affect your brain, and the brain changes remain long after a person stops abusing substances and activities.