All fun and games until a piece lodges in your throat. A lot of professional performers mostly count on things sitting right, and then die when they don't. E.g.:
Then again, there's Stevie Starr, who's passed the ripe old age of 60, and still going strong with swallowing and regurgitating all manner of crazy stuff: https://youtu.be/WVVLyZKtIbI?si=sFDuCGXpdO-CbP8K
Seems pretty hard without teleportation as your mouth is closed when doing this mostly.