Where there’s smoke, there’s Walter

The old saying goes “Where there’s smoke, there’s fire.”
Around here, it goes “Where there’s smoke, there’s Walter.”
Walter smokes. Walter smokes a lot.
I can’t remember any time when I’ve seen Walter not smoking.
Once, I saw Walter asleep at a bar, and his hand reached into his mouth, pulled out his exhausted cigarette, stubbed it out in the ashtray, pulled another from his pack, lit it, and stuck it in his mouth.
Which is why I opened up the coffin and stuck a cigarette in his mouth.
How was I to know someone had dowsed him in gasoline?