Addiction affects some people, while others can use drugs and drink alcohol without having a problem. Genetics is one possible reason behind developing a dependence. Each person takes half of their genes from the mother and half from their father.
These genes are responsible for hair color, eye color, height, body shape, and other general characteristics. They also contribute to the prevalence of some diseases like heart disease or diabetes. If your mother and grandmother had diabetes, you have an increased risk of developing that condition too.
Genetics plays a role in addiction as well. Having a particular genetic makeup can make you vulnerable to an addiction disorder. Studies indicate that genetics may account for 40 to 60 percent of the risk factors for alcoholism, for example.
Genetics is a powerful influencer in addiction. Twin studies indicate that if one twin develops a drug habit, the other is likely to as well and usually to the same substance. What this means is if alcohol dependence runs in your family, you are at risk for developing it too.
The environment is also an influencing factor. Merely having access to alcohol or drugs can make a difference. Someone genetically predisposed may develop an addiction if they take an opioid painkiller. If they never get that prescription, though, they might go their whole life without an opioid use disorder.