My STBXAH is the master of the "Just a Little Pot" routine. But Just a Little became a joint before work, a joint after work, and a joint at night. That became another joint between the afternoon and night one, which became another one overnight, which became another during "breaks" at work, which became leaving jobs frequently to get stoned...which I suspect became Just a Little Pot and Just a Few Beers and Just a Few Pills and Just a Few Snorts.
No such creature as Just A Little for an addict!