A MASSIVE new American government study has found mobile phones can cause tumours in male rats.

The 10-year, $25 million study by the National Toxicology Program found subjecting the rodents to high levels of radiofrequency radiation — the radio waves used by cell phones — resulted in tumours growing around male rats’ hearts, although female rats and mice of either gender didn’t suffer the same consequences.

The vermin’s entire bodies were blasted with way higher levels of the radiation than is allowed for cell phone communication, however, so the scientists warned against drawing links to Snapchat-addicted humans.

“These findings should not be directly extrapolated to human cell phone usage,” NTP senior scientist John Bucher said in a statement.

“We note, however, that the tumours we saw in these studies are similar to tumours previously reported in some studies of frequent cell phone users.”

Exposure to the rays did correlate with lower body weights for newborn rats and their mothers, although the creatures eventually grew to regular size, the study found.

And there was also a “statistically significant” increase in the number of rats and mice with tumours in other organs — including the brain, prostate gland, liver and pancreas — but the researchers determined that the link between those and RFR was unclear.

The study saw the scientists place the rats and mice into special chambers and exposed to the radiation for up to two years in a way that mimics cell phone usage — 10 minutes on and 10 minutes off for a total of just over nine hours a day.

The US Food and Drug Administration’s Center for Devices and Radiological Health issued its own response to the draft study, saying people still have no reason to freak out about getting cancer from too much Candy Crush.

“Based on this current information, we believe the current safety limits for cell phones are acceptable for protecting the public health,” director Jeffrey Shuren said in a statement.