You've probably seen videos of the cinnamon challenge on YouTube.

If you haven't, it's where someone tries to swallow a spoonful of cinnamon . . . and usually starts crying, gagging, dry heaving, and swearing.

Well . . . don't do it...and don't let your kids.

A new study out of the University of Miami found that doing the cinnamon challenge can be seriously DANGEROUS.

If you inhale the cinnamon, you put yourself at risk of real health problems, ranging from throat injuries up to LUNG DISEASE like emphysema.

Last year, poison control centers in the U.S. got 222 calls about people who'd tried swallowing cinnamon . . . that's up from 51 in 2011. And 30 teenagers were hospitalized last year from the cinnamon challenge.

In case you haven't seen it is.