Green’s Dictionary of Slang

burning-down habit n.

[SE burning down + habit n. (1)]

an extremely heavy addiction to narcotics.

[US]‘William Lee’ Junkie (1966) 155: Burning Down Habit, an Oil Burner Habit . . . A heavy habit.
[US]N. Algren Walk on the Wild Side 252: A man would be a fool not to trade off one little flea-powder habit for a real burning-down one, wouldn’t he?