I did the cinnamon challenge like a week ago, just blew my nose this morning…cinnamon in it lol.
It’s extremely unhealthy. Cinnimon in large amounts has a toxic chemical.
People have died from their lungs getting clogged up.
Bad decisions can last a lifetime. When someone gives you a challenge you really should consider the short and long term consequences. Sometimes it’s better to take care of yourself, use your brain, than it is to make your friends laugh. In the end it’s your decision and you pay the price. Surviving some challenges doesn’t make you stronger, it weakens you for life.
From one who cares, take care of your body, you’re stuck with it. 
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True, you can’t get another one. 
That’s why I hate these type of challenges.
Ii heard it was a major medical issue.
Well,there is an eating a raw egg challenge. I think it’s safer and you just gotta chew the shell into bits, and then swallow, although there is a risk of getting salmonella.
I just did the Cinnamon Toast Crunch challenge. It was horrid