[whatshisface]

I'm not a fan of the cell phone EM theories necessarily, but both of the reasons you gave aren't sound. First off, physicists will not be the ones conducting studies about the biological impact of EM waves. That is the wrong department. Secondly, an overall decline could be compatible with dangerous phone rays if there is a larger effect going on in the opposite direction, for example the decreasing environmental concentrations of carcinogens which were discovered and banned recently.

[biesnecker]

Wouldn't we have seen a massive spike in head / mouth / throat cancer, though, even if the overall cancer rates had gone down?

[wizzwizz4]

We might, if we weren't messing with the “proportion smokers” control variable.