"Over the years I’ve smoked a lot of cigarettes," Nelson tells the Washington Post. "I’ve had emphysema and pneumonia four or five times, so my lungs were really screwed up, and I had heard that this stem-cell operation would be good for them. So I said, 'Well, I’m gonna try it out.' But I’m still so sore that I can’t say that it was a success. I’ll have to wait until all the soreness goes away. I think I’ll be able to sing. The only thing that worries me more than anything is carrying my guitar, because they did the operation right in my stomach. But I think I’ll be all right."
Nelson canceled several concerts in October, but he's back on tour through the end of November (he's in Columbia, SC tonight).
Chong's suffering from rectal cancer. His surgery also took place in October.