Other than the fact he smoked like a chimney. He crash landed his plane due to lack of oxygen as he flew over a mountain range outside of LA some place. I think he came down in a construction site - not badly hurt.
There is more to that story. The forced landing was in Prescott Valley, Arizona. He was lucky to set it down on the relatively flat prairie there, as it is in a valley surrounded by mountain peaks extending some three thousand feet higher AGL.
A guy I know was one of the construction workers who witnessed the incident. Swayze was heavily intoxicated. At his request, the workers cleaned a couple of six-packs' worth of beer bottles out of the aircraft, and my friend took him home and let him sleep it off on his sofa before the crash investigation could be commenced.
Chronic pancreatitis due to alcoholism is likely to have been a bigger factor in the development of his pancreatic cancer than his smoking history. Sadly, he was a well known drunk.