I did once because I didn’t know that such an action was dangerous. I later found out that you shouldn’t swallow gum because it’s so sticky and gooey that it can become an obstruction inside you. A few years later, I suddenly thought of the time I swallowed gum and felt worried that the gum would stay stuck in my body literally forever! (However, I am now aware that gum can come out of you, and it only takes up to three days for that to happen.)