The approximate number of cigarette packs contained in a 4000 puff disposable vape will depend on the nicotine strength of the vape. As a rough estimate, a disposable vape with a nicotine strength of 20mg/ml could be equivalent to approximately 200 cigarettes or 10 packs of cigarettes. However, it is important to note that the exact number of cigarettes represented by a disposable vape will depend on the brand, nicotine strength, and number of puffs taken.