Genes may determine how:
The body reacts to a drug
A person responds to a drug
A person responds to their environment
Negative environmental influences can increase the likelihood of misusing opioids and drug abuse:
Friends that are a source of negative peer pressure
Unsatisfactory quality of life
A family history of substance abuse
The younger someone starts using opioids, the more likely it is to become a serious problem.
This is because young, adolescent brains have not fully developed in the areas that control decision making, judgment, and self-control.
Though brain development plays a role, misusing opioids can lead to dependence and drug addiction, no matter how old you are.