It is likely that during the formation of most stars, comets are formed from the same gas and dust that the star and any planets it hosts were formed from. Extrapolating what we know and strongly believe about our own star, the Sun, it is likely that many or most stars have a cloud of comets around them analogous to our Oort-cloud (which hasn't been "proven," but is strongly suggested by observation of comets).
As stars orbit the galactic center, they pass by one another - sometimes extremely closely, sometimes not very close. During these encounters, the gravitational interactions will shake things up in the Oort-like clouds. In some cases, comets that are otherwise minding their own business, orbiting far from the star, will be kicked inward. Others will likely be ejected. Some of those ejected will eventually find themselves orbiting another star, and possibly falling inward for a close encounter with the star and any planets.
In the long run, it's likely that interstellar space is riddled with rogue comets. Many comets in our solar system may have come from there, and many of the comets formed around our sun have likely been flung off, in some cases to find new stars to orbit.
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