Certain psychological factors have to also come into play. There is no specific alcoholic personality, but people do have to drink to become alcoholic. Alcohol is reinforcing to some people and to some people it is not. You have to like drinking to drink. Drinking behavior naturally increases if it is reinforced.
Drug abuse is a biopsychosocial disease.
It has biological components, psychological components, and social components. Two or more of these elements appear to be necessary for drug abuse to exist. Someone has a drug problem if they continue to use a drug despite persistent physical, psychological, or social problems associated with that drug. Anyone who continues to use despite persistent problems is an abuser. Obviously if you get into trouble when you use chemicals you shouldn't use chemicals.