Slideshow: The Top 5 Deadliest Drugs

The danger of IV drugs like heroin is well established, but in the age of "designer drugs," some of the greatest health risks come from some lesser-known substances. Based on academic studies, news reports, and interviews with experts, OCCRP created an unscientific ranking of the top 5 most deadly illicit drugs. Click through the slideshow to read about these substances in order of how lethal each is.