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You're asking more than one question. Does it? It can. Can it? Yes. Will it? Probably not in and of itself; but it might. How's that for an answer?
Weight gain does not tend to be one of the most prominent side effects; in fact, many experience a degree nausea and reduced appetite. However, opiates do have a depressant effect, and in the grand scheme of things, those requiring pain medications are inherently likely to be performing less physical activity; and its additional sedative effects may further reduce overall physical activity.
There may be some correleation between the use of opiate use and weight gain, but it is more likely to result from related issues than the medication itself.