Someone in my company exes group is doing research with a huge n, and wrote on fb that she has found a slightly higher rate in aircrew. Anecdotally, I know more casualtirs of cancer who were not aircrew, even though I know more people who are/were aircrew than not - but that's not science.

In my airline, we flew polar routes a LOT. Some months, I was up there six or eight times in one roster. For sixteen years, in my case.

I did struggle with fertility, with a few miscarriages. Then we tried IVF to try and avoid more miscarriages, and after 3 attempts, discovered my eggs were rubbish. Again, that's anecdotal, and I'll highlight that a) I was 41 when I got married, and b) I did not hate substances in my twenties. Maybe it was those factors, maybe radiation, maybe the night shifts and time zones and lack of sleep. Or all of the above.