The word "souvenir" has, of course, slightly extended itself in meaning until it now denotes almost anything either breakable or useless; but even today, ninety per cent of the items covered by the word are forgettable objects in which cigarettes can be left to go stale.
Alan Coren (2008). “Chocolate and Cuckoo Clocks: The Essential Alan Coren”, p.183, Canongate Books