Your sentence is type 2 conditional sentence. Hence the if-clause is in the past tense and the main verb is in the 'conditional' tense. However, the past tense in this is not a real past tense, it is a subjunctive.
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AnonymousIt's a real conditional question, this is why we use the past form of the verb in this senctence.Can someone confirm if this is correct?
AnonymousAre you saying that it's also correct for one to say,"would you mind if I smoke?"That is fine.