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First, I am not a mechanic.
But I am an old guy who has messed with cars for the past 40 years. (this by way of qualifications)
A misfire should not weaken other components of the engine. A misfire means the plug did not ignite properly and the fuel charge did not burn. When this happens, the fuel charge is pushed out through the exhaust valve during the appropriate cycle. The other cylinders would have been working properly. No additional stresses would have occurred due to the lack of firing in this cylinder.
HOWEVER
You would have been pushing raw gas into your exhaust system. This can potentially harmful to your cat. converter. You might want to have them give you an extension of the warranty on your exhaust.
Good luck
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