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There is no right to break a lease just because a fire occurred or because something happened in another apartment.
The fact that there is a smell isn't likely to provide a reason to break the lease as well since the fire just happened a couple of days ago. At some point it could become an issue but that would have to be after they completed their repairs.
You certainly want to notify your landlord, by certified mail, return receipt requested, that the smoke detector didn't work the night of the fire and is still not working and also asking that it be replaced. However, that would also take a few days before they would be in any kind of trouble or subject to this being considered a "constructive eviction" or a reason for a lease being broken.
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