Cinnamon is made from the bark of Cinnamomum trees. Cinnamon powder has been compared to sawdust. “Ground cinnamon is sawdust. But there is good sawdust and bad sawdust,” a Chicago (IL) Tribune article in 2001 printed.
 
“Cinnamon is sawdust” was posted on Twitter on March 27, 2009. “Cinnamon = spicy sawdust” was posted on Twitter on February 27, 2012. “Cinnamon is /sawdust/.  Tasty, tasty sawdust” was posted on Twitter on April 22, 2013. “Cinnamon is really just delicious sawdust” was posted on Reddit—Shower Thoughts on July 22, 2016.
 
   
Wikipedia: Cinnamon
Cinnamon (/ˈsɪnəmən/ SIN-ə-mən) is a spice obtained from the inner bark of several tree species from the genus Cinnamomum. Cinnamon is used mainly as an aromatic condiment and flavoring additive in a wide variety of cuisines, sweet and savoury dishes, breakfast cereals, snackfoods, and traditional foods. The aroma and flavor of cinnamon derive from its essential oil and principal component, cinnamaldehyde, as well as numerous other constituents, including eugenol.
       
Chicago (IL) Tribune
The search for Cinnamon.
The northern forests of Vietnam offer some of the best cinnamon in the world
July 25, 2001 | By Kristin Eddy, Tribune staff reporter.
(...)
“What is cinnamon? It’s tree bark,” said Tom Erd, co-owner of The Spice House in Evanston. “Ground cinnamon is sawdust. But there is good sawdust and bad sawdust.”
           
Twitter
Caleb H‏
@Wakazed
Cinnamon is sawdust.
5:01 PM - 27 Mar 2009
 
Twitter
hentosz‏
@hentosz
Cinnamon is, essentially, sawdust.
And now you know.
9:31 AM - 18 Apr 2010
 
Twitter
Jerid Scott Elzinga‏
@JSElzinga
Replying to @tRPShow
@RyanPainterShow cinnamon = spicy sawdust
2:51 PM - 27 Feb 2012
 
Twitter     
Jay Ashworth‏
@_Baylink
RENINDER: Cinnamon is /sawdust/.  Tasty, tasty sawdust - http://po.st/MpazYv/  #darwinawards
8:08 AM - 22 Apr 2013
 
Twitterr
Inaki‏
@aliveinthewired
Replying to @kimmouto
@yurifingers Is it ground cinnamon or cinnamon bark? You shouldn’t use spices, they taste like sawdust.
3:08 AM - 5 Jun 2013
 
Twitter
KMH‏
@LosDoorknockers
Just found out that cinnamon is mainly sawdust. So gross
7:47 PM - 3 Sep 2013
 
Reddit—TIL (Today I Learned)
Cinnamon powder is basically sawdust (forbes.com)
submitted July 14, 2014 by diamondjo
 
Reddit—Shower Thoughts
cinnamon powder is really just sawdust…
submitted July 20, 2014 by Rondelcid
Glorified sawdust
     
Reddit—Shower Thoughts
Cinnamon is just delicious sawdust.
submitted June 17, 2016 by TheChingon
 
Reddit—Shower Thoughts
Cinnamon is really just delicious sawdust.
submitted July 22, 2016 by FondSteam39
     
Reddit—Shower Thoughts
Cinnamon is just flavoured sawdust.
submitted January 13, 2018 by Choo_Choo_Bitches
 
Reddit—Shower Thoughts
Cinnamon is everyone’s favorite flavor of sawdust
submitted February 3, 2018 by Kazhmyr1