Eating more than 1/4 of a teaspoon of cinnamon in one sitting can be toxic. And I'm a freak of nature when it comes to useless health and medical info!
^ Really? Wow. I drink hot lemon & cinnamon in the mornings, the quantity usually is around 1/4 - 1/2 tsp. Maybe I have a high cinnamon tolerance xD
You can OD on nutmeg too, oddly enough.