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Not a medicine doctor, but your overuse of steroidal nasal spray is the probable cause of your stuffy nose.

That is entirely dependent on the type of steroidal nosespray. There are types that don't cause dependence or stuffy nose when not used.

Probably not. Steroid sprays are not the same as the OTC nasal congestion sprays that often lead to stuffy nose as soon as you stop taking them.