The lungs are exposed to air, but they're also exposed to a lot of bloodborne compounds, since a full vascular cycle goes through the pulmonary arteries.
The null hypothesis is "it's something in the air", but with the increase in non-lung cancers in young people[1] noted over the past decade, it's entirely possible it's something else, and lung tissue is one of the susceptible ones to whatever it is.
The null hypothesis is "it's something in the air", but with the increase in non-lung cancers in young people[1] noted over the past decade, it's entirely possible it's something else, and lung tissue is one of the susceptible ones to whatever it is.
[1] https://www.cancer.gov/news-events/cancer-currents-blog/2025...