I suspect it might end up being an all or the above kind of situation, perhaps mixed in with transgenerational effects from atmospheric atomic tests and so forth (https://www.youtube.com/watch?v=LLCF7vPanrY, https://web.archive.org/web/20200507112343/https://www.cdc.g..., & https://www.americanscientist.org/article/fallout-from-nucle...)
