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I read a convincing piece that much of the problem is the residual radiation from polonium which is a part of the calcium phosphate mined for phosphate fertilizer, critical for the growing of tobacco. Supposedly cigarette smoke contains more alpha particles than it should.
The details were in a study conducted in 1983 but I don't know why nobody paid attention. There are alternatives to get phosphates.
If smoking could be made to be 100% safe, I'd do it. After all, it makes you look cool.
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