Have you heard about the 'cinnamon challenge'? The dare is to try and swallow a spoonful of cinnamon without water, and it's gone viral—with 30,000 related videos currently on YouTube. Seem strange? It is, but it's not really something to laugh at.The dare is most popular with kids and teenagers, but even the governor of Illinois did it on a live radio show. Not surprisingly, doctors are alarmed at this growing trend. According to this recent article in The Wall Street Journal, cinnamon doesn't break down very fast and can cause gagging, vomiting, or worse, serious lung inflammation.