"If You Mess With The Bull"

Paul Gleason, who played the principal in "The Breakfast Club" died over the weekend. That was a great movie. I've learned that he made numerous guest appearances in TV shows from the 1970s such as "Love American Style", "Adam-12", "Mission: Impossible" that I'd love to see now. And he died from mesothelioma - a cancer caused by asbestos. What's that about?