If cell phone radiation giving us all cancer and prematurely wiping out the nearly 2 billion people that use smartphonesworldwide wasn't enough to worry about, a new study suggests our precious hand-screens are giving us all back problems, too. Of course they are.

According to a study published in Surgery Technology International, chronic screen-staring could be adding up to 60 pounds of force to your spine, depending on if you're more of an eye-shifter or all-out huncher when it comes to reading texts and scrolling through what you've missed on Instagram.

The human head is not weightless, it turns out, so when you tilt it forward it is, in effect, pulling on your spine in a way that your spine isn't meant to be pulled on so frequently. Writes back surgeon Kenneth Hansraj: "As the head tilts forward the forces seen by the neck surges to 27 pounds at 15 degrees, 40 pounds at 30 degrees, 49 pounds at 45 degrees and 60 pounds at 60 degrees."

You're not going to throw your back out after a single heavy day of phone-gazing, but over time the added stress "could deteriorate the back and neck muscles to the point of needing surgery."

But if back surgery's not your thing, there's hope: The radiation cancer could wipe us all out first.

[H/T: Science of Us