Spot on, Bob. Upwards of ten percent or more of lung cancer may be among non-users of tobacco. I am of an age that whether one smoked or not, we were exposed in cafes and even in airplanes. You are also spot on about screening. Catch it early and we'll probably cure it. Most lung cancers are locally advanced or metastatic at diagnosis. Thank you for reading the piece, and for your astute observations.