What's silly about it? It's totally fair, if the house doesn't belong to you then it isn't up to you what you do with it. If you leant me your car and it came back with loads of cig burns in the seats and rubbish in the footwells, the response "well it was technically mine at the time so I smoked 20 Lamberts and ate a ****load of Maccy D's" wouldn't really satisfy you, would it?
In the same way, if I rented my house out on the strict understanding that it wouldn't be smoked in, I wouldn't be happy if at the end of the tenancy I came back to nicotine stained walls, cig burned carpets and stinking rooms. If you live in a council house, then unless you're doing that thing where you're eventually gonna buy it from them it isn't yours to do what you want with, therefore you must respect the rules because there'll no doubt be somebody in there after you.