Pepsi(-Cola) habit, n. — Green’s Dictionary of Slang

Pepsi(-Cola) habit n.

also Pepsi-Cola kick

[Pepsi-Cola, a soft rather than alcoholic drink + habit n. (1)/kick n.⁵ (1)]

(drugs) a limited or occasional use of drugs.

1967		P. Thomas Down These Mean Streets (1970) 200: I never figured on getting hooked all the way. I was only gonna play it for a Pepsi-Cola kick.
2001		ONDCP Street Terms 16: Pepsi habit — Occasional use of drugs.