It’s now believed that more people have died because of the toxic exposures they got from the 9/11 sites than were killed by the terrorists on that day. Survivors, first responders and volunteers have faced everything from cancer to respiratory disorders to PTSD. Horizons moderator William Brangham explores the long-term health impacts with Dr. Michael Crane, Dr. Benjamin Luft and John Feal. #pbsnews #pbsnewshour #newshour #news #911 #september11 #september112001 #worldtradecenter #health #airqu