Fair enough. I kinda forgot that smoking is still a thing. But it's been on a big decline for years, hasn't it? Surely this isn't some new and growing danger?
Probably has, even though there's still a lot of people who smoke. Think it will be a while before it really can be considered a more rare occurrence/habit.
Considering how many people still do it, it could be considered as part of our culture.
Otherwise i don't know any sources of radiation. Besides some places where the atmosphere is getting thin, and getting skin cancer is very normal, like Australia.
It is getting better, but it won't really recover until 2050 to 2060's AFAIK. That said, there are other gasses which might still be bad to let into the atmosphere, so we still don't understand it a 100% There's also the ozone hole, which partly affects Australia [0], but mostly Antarctica. I think it is really interesting, that about 2/3 of people in Australia will get skin cancer at some point, and I've wondered whether it's due to the increased exposure to, what is essentially radiation, or just the mass migration of people who were originally not native to the region. Thus they don't handle the sun as well, as say, Aboriginals.
[0] https://www.verywellmind.com/radioactive-chemicals-in-cigare...