You can also drink it, though not a good idea to have more than a few sips due to the extra weight and different reactivity. You might feel dizzy if you drank a few glasses worth and it replaced the ordinary water in your inner ear.

Also, heavy water is typically slightly radioactive due to it usually containing tritiated water (T2O), though regular water can also contain that.

Apparently, swapping 20% of your cells' water with heavy water is survivable, but if you try this, don't blame me if you go sterile (cell mitosis will likely be affected).