I hope you are all well.
He stopped to smoke.
Is to smoke a complement of stop or is it an infinitive-of-purpose adjunct?
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It means that he wanted to smoke and he stopped for that purpose.If you use gerund in the sentence you mean that he gave up smoking. and you can take a close look at " https://dictionary.cambridge.org/tr/dilbilgisi/ingiliz-dilbilgisi/verb-patterns/stop-ing-form-or-to-infinitive "
i hope i could help.Have a good day.