A drug addict smokes cigarette at a drop-in center and shelter, south of Tehran, Iran. Anti-narcotics and medical officials say more than 2.2 million of Iran's 80 million citizens already are addicted to illegal drugs, including 1.3 million on registered treatment programs.

Female drug addicts pray in their dorm, at Chitgar treatment camp, in a mountain village northwest of Tehran, Iran.

Drug addicts gather around a fire to warm themselves in a suburb of Tehran, Iran. Anti-narcotics and medical officials say the number of citizens addicted to illegal drugs keeps rising annually, even though use of the death penalty against convicted smugglers has increased, too, and now accounts for more than nine of every 10 executions.

Drug addicts play volleyball at a treatment camp in Verdij, about 15 miles northwest of Tehran.

Drug addicts sleep in their chairs at a drop-in center and shelter south of Tehran.

A female addict uses crystal meth around midnight in a Tehran street.