AM is correct
I don't have the paper references handy (google it), but there is solid evidence that SMALL, long-term exposure to low-level toxins (such as cigarette smoke) measurably reduces the incidents of cancer. The optimal exposure level is small (probably less than a day of second-hand smoke), but it's most certainly greater than zero. If I remember right it's around 1 cigarette per day worth.
This also goes for various polluted areas, where cancer rates were surprisingly reduced. Something similar may happen in Japan, at least in some areas.
While the statistics are clear, the mechanisms aren't fully understood. The leading opinion is that slight stresses from environmental toxins kill off cancer cells just a bit faster than other cells, and before as many mutate to become malignant.
Obviously this kind of subject is taboo (pollution is good!), but objectively the evidence is solid.
I don't have the paper references handy (google it), but there is solid evidence that SMALL, long-term exposure to low-level toxins (such as cigarette smoke) measurably reduces the incidents of cancer. The optimal exposure level is small (probably less than a day of second-hand smoke), but it's most certainly greater than zero. If I remember right it's around 1 cigarette per day worth.
This also goes for various polluted areas, where cancer rates were surprisingly reduced. Something similar may happen in Japan, at least in some areas.
While the statistics are clear, the mechanisms aren't fully understood. The leading opinion is that slight stresses from environmental toxins kill off cancer cells just a bit faster than other cells, and before as many mutate to become malignant.
Obviously this kind of subject is taboo (pollution is good!), but objectively the evidence is solid.