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 n

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. [1] https://www.cancer.gov/news-events/cancer-currents-blog/2025/early-onset-cancer-research-environment-genetics-support https://www.cancer.gov/news-events/cancer-currents-blog/2025...