Man severely burned in U.P. fire cause by chemical used to extract THC from marijuana plants Updated 11:00 AM; Facebook Share MARQUETTE, MI – A chemical used to extract THC from marijuana plants caused a fire that sent one person to the hospital in Michigan’s Upper Peninsula. WLUC-TV reports that a 24-year-old Marquette man suffered burns in the fire, which occurred in a detached garage at Summit Street and Fitch Avenue in Marquette on Tuesday evening. Police say the man was using a flammable chemical to extract THC from marijuana plants, which caused the flash fire. He was severely injured and later transferred from UPHS-Marquette to University of Michigan Hospital for further burn treatment, the TV station reported.