I was pulling weeds around our house and throwing them on our burn pile. I did not realize that there was poison ivy in the weeds, and I was directly in the line of the smoke.
A couple of days later I noticed I had the rash in my mouth, and a week later, was admitted to the hospital with a collapsed lung, compliments of the poison ivy that I had burned, and inhaled.
Eventually, they had to remove the top portion of the affected lung, as the condition would not go away, and my lung continued to collapse.