Hi, I am so sorry to hear about your dad but am happy that you can come here to ask questions and vent. I am a little late into this thread, but as I have posted in the past, I have been asked the same question about my mom. Never once did I feel it was being asked maliciously. I usually respond that she did smoke for about 40 years, quit 7 years befoire being diagnosed and still was diagnosed with cancer. After that, I use the opening to let people know that at least 15% of lung cancer is diagnosed in never smokers. There are so many horrible diseases out there. I really believe that MOST people are trying to assure themselves that since they don't smoke, lung cancer is one disease they don't have to worry about. They are NOT trying to blame my mom for her diagnosis, they are just hoping that they won't get it. Unfortunately, after I fill them in, they realize that they are not safe from the diagnosis at all. I realize that this response is a bit different from many above. Because I feel that no one has ever asked me this question maliciously, I could never turn it back on them with "why do you ask" I'd rather explain it the way I stated above. My mother has asked me to use her diagnosis to educate others about lung cancer. She will be the first to tell people that HER cancer was caused by smoking. Since being diagnosed, 2 of my aunts and several cousins have all quit smoking. When my mom is trying to make some sense of this disease, she thinks about that. I wish your dad the very best with his treatment. This is a terrible disease that no one deserves to get. Shelley