Sad news. I hope there are new treatments on the horizon that Rush will take full advantage of. I hope and pray he can beat this.
Gosh, I just read the other days that most people diagnosed with lung cancer are former smokers, by many years, 10-20 years. So much for feeling proud and healthy once you quit.
Perhaps small tumors develop early on and sit relatively dormant, suppressed by the immune system, until resistance ebbs for one reason or another, at which time they break out.