"I'm too young to smoke."

In "Git Along Lil Duckie" (1953), the Fox (masquerading as a cowboy) attempts to offer Huey a cigarette that he filled with gunpowder in an attempt to kill him. Unfortunately for the Fox, Huey politely declines the offer and sticks the cigarette into the former's mouth, after it was already lit.

Example of:
Explosive Cigar