My child went through a phase of swallowing a bunch of gum. He got appendicitis. It might have been a coincidence. The article does not mention appendicitis but some of the symptoms are the same as intestinal blockage.
Once during a LAN party (back when those were a thing) I chewed gum for 24 hours straight. Near the end of the 24 hours it quite suddenly turned to dust in my mouth. It's anecdotal of course but I'd be highly surprised if enough gum made it through the stommach intact to cause issues farther down the line if it can't even survive the mouth for any appreciable length of time.
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