Re: Skin cancer
Detail required. For example: Increase in skin cancer where? Is the distribution of towers the same as the distribution of skin cancers? The rate of skin cancers in Australia has been going down for years, while the phone coverage has been going up.
All other possibilities eliminated? Has there, for example, been a reduction in people's use of sunscreen? You could also say that the world population has increased over the same period, and therefore population causes skin cancer.
Correlation != Causation.