Not necessarily. If cellphones gave cancers to 1 promille of users it would be darn difficult to prove anything but it would still be much higher rate than many

Not necessarily. If cellphones gave cancers to 1 promille of users it would be darn difficult to prove anything but it would still be much higher rate than many other factors. The difficulty is in getting statistics right. How do you compare two groups of people controlling for the variable when people who don't use cellphones are very different in other aspects than people who do.