Check your mug to see if it has thin dark streaks or cracks inside or outside it. If it does, that means that the coating has cracked and let water in. This is bad for two reasons, 1, you probably have a lot of bacteria growing inside your mug, and 2, that water gets super hot super easily and turns into steam meaning your mug can explode at any time.
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u/CrimsonFox99 9h ago
You can also use it to heat water for tea, but that makes people big mad.