system
Given the following post, respond as if you're commenting on Reddit:
human
Do airline crews suffer a higher ratio of radiation illnesses?

It seems to me that even a marginal exposure, over a large number that work in the business would result in a higher incidents of cancer or other illnesses vs the average population.
gpt
The amount of radiation received by airline crews is small roughly 2 mSv per year. It's not known with certainty whether these levels are harmful or not. According to the linear no-threshold model, any amount of radiation increases the risk of cancer, however, according to the radiation hormesis hypothesis, small amounts of radiation actually decrease the chance of cancer. If the linear no-threshold model is correct, then the effect would still be small, 1 Sv increases the chance of developing cancer by 5%, working for 20 years would receive roughly 40 mSv. Which would result in a 0.2 % higher chance of developing cancer.

There are studies underway in areas with high levels of natural background radiation to determine the effects of long term exposure to low levels of radiation. The city of Ramsar, Iran has the highest natural background radiation levels in the world, with some people receiving doses great than 100 mSv per year. Wikipedia has this to say about the area

>Early anecdotal evidence from local doctors and preliminary cytogenetic studies suggested that there may be no such harmful effect, and possibly even a radioadaptive effect.[8] More recent epidemiological data show a slightly reduced lung cancer rate[9] and non-significantly elevated morbidity, but the small size of the population (only 1800 inhabitants in the high-background areas) will require a longer monitoring period to draw definitive conclusions.[10] Furthermore, there are questions regarding possible non-cancer effects of the radiation background. An Iranian study has shown that people in the area have a significantly higher expression of CD69 gene and also a higher incidence of stable and unstable chromosomal aberrations.[11] Chromosomal aberrations have been found in other studies[12] and a possible elevation of female infertility has been reported.[13]