What signs suggest drug addiction?

Signs that may suggest drug addiction include using more than intended, being unable to cut down, strong cravings, spending excessive time getting or using the drug, and continuing to use despite problems at home, work, school, or in relationships. Other important signs include using in physically risky situations, giving up important activities, and continuing to use even when it is clearly causing harm.

Physical signs can include tolerance and withdrawal, but those alone do not prove addiction. Some people develop tolerance or withdrawal from repeated exposure to certain substances without meeting full criteria for a substance use disorder. What matters most is the overall pattern: impaired control, harmful consequences, and persistence over time.

Behaviorally, people may become more secretive, unreliable, preoccupied with using, or less engaged in responsibilities and relationships. No single sign confirms addiction by itself; concern rises when multiple signs appear together and the person keeps using despite obvious negative effects.