Well, I gave you a link to Merriam-Webster dictionary 2 post back. They list is as a noun. Of course you can be stubborn, and continue to claim that is is a verb.
Just for the humor of it... if it was a verb, please tell me which conjugation of "to consume" would "consumption" be?
To consume
I consumed
he consumes
they were consuming
I will be consuming
Who consumption?
