The Washington Post  
 
Synthetic marijuana, also known as spice, is causing violent behavior and dangerous overdoses across the country.
Health officials in Illinois are warning people about mock marijuana that is spreading across Chicago and the central part of the state, causing severe bleeding among users and, in some cases, death.

Synthetic cannabinoids, also known as K2 or Spice, has been linked to 56 cases in which people in the state experienced severe bleeding after using the substance, officials with the Illinois Department of Public Health said in a statement. The users were hospitalized — and two of them died — after coughing up blood, finding blood in their urine or bleeding from their noses or gums, officials said.