Crazy to realize that 15-25% of lung cancer deaths occur in people with no or (negligible) smoking history. Lung cancer is by far the biggest cancer killer worldwide, but it receives way less per capita research funding relative to some other types, perhaps in part because of the perception that patients “brought it on themselves”.
Yeah there's lots of factors that go into it. Prevention is better than cure so all the emphasis is on smoking cessation.
It predominantly affects working class men, so there's a little bit of I don't know if snobbery is the right word. But certainly it doesn't have the powerful advocates that say breast cancer does where white middle class metropolitan women have mobilised brilliantly the last 20-30 years to change breast cancer survival rates from 50% to 90%
Also, the key word is "worldwide". In the west smoking has fallen, and continues to fall every year, leading to lower lung cancer rates. Most of the deaths are in the developing and 3rd world. Most of the money and the research is in the west, so lung cancer is lower down the priority list.