Just decades ago, cigarettes were thought to be relatively harmless. Obviously, the times have changed.
Some health professionals fear smartwatches and other wearable computers could be just as dangerous.
The reason, according to The New York Times, is radiation. Cell phones give off small amounts of it. But if that small amount is in constant contact with a human body, like a phone that lives in someone's hands and pocket, it could add up.
And smartwatches could be just as dangerous.
Several studies have linked cell phones to dangerous side effects. The International Agency for Research on Cancer called phones "possibly carcinogenic," but relatively safer if they're kept far from the head.
A Swedish study said that lengthy calls could triple the risk of a type of brain cancer.
But it's not all doom and gloom for the smartwatch. The Apple Watch doesn't use a 4G signal, just Bluetooth and WiFi. There's no evidence that those frequencies are bad for the body. However, other watches, like the Samsung Gear S, use those potentially harmful frequencies.
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