DNA isn’t the only factors that makes substance abuse and addiction hereditary; environmental factors can also make this condition hereditary.
While the environmental factors that a person is exposed to aren’t hereditary, per say, it can be said that these factors are often passed on from generation to generation. For example, if your grandparents were alcoholics, your parents were exposed to alcohol abuse, and in turn, they may have become alcoholics. Growing up, you may have been exposed to your parents’ excessive use of alcohol, which may have influenced you to use, abuse, and become dependent on alcohol.
Trauma may also play a role in the development of an addiction. Research has found that children and adolescents who undergo traumatic events are more likely to abuse and become dependent on substances later in life. This trauma may be the result of physical or sexual abuse, or experiencing adverse conditions while growing up; serious financial problems, homelessness, etc Again, trauma isn’t hereditary, as anyone can suffer a traumatic ordeal; however, studies have indicated that many people who experience trauma also have relatives who experiences traumatic events (physical or sexual abuse, homelessness, and so forth). In order to cope with these traumatic events, many people turn to drugs or alcohol, which further increases the chance of being exposed to substance abuse on an environmental level. It also further increases the risk of genetic predisposition to addiction.