The impact of 9/11 is with us even today. More people have now died from toxic exposure than in the actual 9/11 attacks. 

Although almost 3,000 people lost their lives that day, 4,343 survivors and first responders have died in the years since, according to the World Trade Center Health Program.

Respiratory diseases and cancer have caused the most deaths among first responders over the past two decades-plus. The toxic cloud of dangerous particles inhaled by so many first responders made their bodies more susceptible to these illnesses.