It doesn’t work here because “sniff your own farts” is already an idiom that means “believe your own bullshit” - aka delusional.
Eating your own dogfood is laudable - sniffing your own farts is not.
Eating your own dogfood is laudable - sniffing your own farts is not.
Smelling Your Own Dog Farts would also be acceptable...
Solved it.