Health authorities recommend caution when using cell phones

The argument

Although the health risks associated with cell phones are debated by various proponents, the organizations which are formally responsible for providing expert opinions about public health issues have not adopted definitive positions on safety or danger of cellular technology, instead recommending caution and further study. Among others, the World Health Organization, the U.S. National Cancer Institute, and the U.S. Centers for Disease Control and Prevention have all made public statements that more research is essential to clarify the relationship between cancer and cell phones. The positions of these expert organizations can be regarded as a strong indication of the current scientific and medical consensus, which is that the risks associated with cell phone use are still unclear.

Premises

Counter-arguments

A call for further research is a statement about research priorities, not a measure of where the evidence stands. Public health bodies routinely recommend continued study of questions they regard as substantially settled, because monitoring a technology used by billions of people is prudent regardless of the current balance of findings. The test is what those bodies conclude, and their substantive positions do not amount to equipoise: decades of national cancer registry data covering a period of rapidly rising mobile phone use have not shown the increase in brain tumour incidence that an effect of the claimed size would produce, and large cohort and case-control studies have not established one. The classification usually invoked also records something narrower than the argument implies. Placing radiofrequency fields in the "possibly carcinogenic" category is a statement that some evidence exists and is limited, not that risk is genuinely unresolved — the same category contains agents for which the evidence is weak, and the classification concerns hazard identification rather than the size of any risk. "Unclear" is doing two jobs here as well: it can mean the evidence is evenly balanced, or that a small effect cannot be excluded while none has been demonstrated. The second is closer to the expert position, and much nearer the sibling position that phones do not cause cancer than to real uncertainty. The mechanism question is not open in the same way either, since non-ionising radiation at these frequencies and power levels does not break chemical bonds — which is why the burden has remained with the positive claim.

Rejecting the premises

[Rejecting P1] That expert bodies call for further research reflects research priorities and the prudence of monitoring a technology in near-universal use, rather than indicating that the balance of evidence is unresolved. [Rejecting P2] Their substantive positions do not amount to equipoise: the "possibly carcinogenic" classification records limited evidence about hazard rather than unresolved risk, decades of registry data have not shown the rise in incidence a real effect would produce, and no mechanism has been established for non-ionising radiation at these power levels.