Alcohol and drug addiction is a serious condition that affects not only the individual but the entire family. Alcohol, cocaine, steroids, prescription drugs, and marijuana can be an addictive substances. Not everybody who ingests alcohol or other drugs will develop an addiction. Still, some people could be more prone to addiction. Alcohol or substance addiction refers to a psychosomatic and physical dependency on that particular substance. Mental health, physical health and emotional health all decline when continuing substance abuse is an issue.