Since you have been a bit slow on the responses. I will give you some more hints.
Actually there are a lot of people coming to buy... cigarettes from these people. Same pattern all the time. They take out a bundle of notes. Knock on the door. Hand the notes through the door. Door closes. They wait around. A minute later, the door opens and they get a golden box of Benson & Hedges cigarettes, and leave.
Judging by the thickness of that bundle of money changing hand for one box of cigarettes, those cigarettes are the most expensive EVER!
Anyway, drug dealing neighbours was not what were gonna talk about today.