I'll only do it ..... you promise to quit smoking

[Englishlearner]

I'll only do it ..... you promise to quit smoking. (*) if (*) nor (*) yet (*) but

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This is a companion discussion topic for the original entry at https://english.best/questions/20921,ill-only-do-it-___-you-promise-to-quit-smoking/

[Nadia]

I’ll only do it if you promise to quit smoking.