Or was it a familiar?

A neighbouring flat reeks of cigarette smoke and sweat. On occasion, I've surreptitiously sprayed Glen 20 into the stairwell to clear the air. Could it *be* any more offensive? Yuh-huh. The other night, as I walked towards it, I noticed the wooden door was open and a cat was peering out of the screen door. "Hello, puss," I said. It hissed at me like it really meant it, then again for good measure.