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Cancer rates have increased in perception only, this is due to better screening methods, discoveries of new forms of cancer etc. If you look at deaths per capita, the rate is falling. In the 1700's the cancer rate would have been about zilch, would have been blamed on some obscure ailment...

Building on what Meconium has said, the only reason we have a water filter is because Adelaide water is undrinkable. When we moved into our house we had to wait two weeks to get the filter on, thought nothing of it till we tried it, then ended up getting some goons of water.