abused drugs in Denver remain alcohol and marijuana. However, heroin's climb in popularity does not Keto Flame seem to be declining. In 2010 heroin overdoses ranked third behind marijuana and cocaine for emergency room visits. In 2011, about 18 percent of all Denver residents who were admitted to substance abuse treatment centers were opiate addicts, according to the Colorado Health Foundation. Heroin and opiates are the third leading cause of death for alcohol or drug related fatalities in Denver.