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Anyone who takes opioids is at risk of developing addiction. Your personal history and the length of time you use opioids play a role, but it's impossible to predict who's vulnerable to eventual dependence on and abuse of these drugs. Legal or illegal, stolen and shared, these drugs are responsible for the majority of overdose deaths in the U.S. today.

Addiction is a condition in which something that started as pleasurable now feels like something you can't live without. Doctors define drug addiction as an irresistible craving for a drug, out-of-control and compulsive use of the drug, and continued use of the drug despite repeated, harmful consequences. Opioids are highly addictive, in large part because they activate powerful reward centers in your brain.

Opioids trigger the release of endorphins, your brain's feel-good neurotransmitters. Endorphins muffle your perception of pain and boost feelings of pleasure, creating a temporary but powerful sense of well-being. When an opioid dose wears off, you may find yourself wanting those good feelings back, as soon as possible. This is the first milestone on the path toward potential addiction.