Cinnamon is healthy for you but you should never eat straight cinnamon as in straight from the cinnamon bottle on a spoon.
If you try to eat straight cinnamon it can pose a choking hazard which could kill you if you don't get something to drink right away to dilute the cinnamon.
Eating cinnamon in baked goods or adding the cinnamon to water, tea, coffee etc is not harmful but there have been some kids and teens doing a cinnamon challenge and consuming the cinnamon directly into their mouths.
Then a few of those kids and teens choked on the straight cinnamon doing the cinnamon challenge and died as a result.
So never try to consume straight cinnamon because you'll start choking and could die as a result.
However just putting a few sprinkles of cinnamon in your mouth and swallowing it shouldn't harm you but never put anymore than that of straight cinnamon into your mouth.