Yeah... It meant to be placed in a tub of water. This person put it in 4 cups of water. .... Im sure those with reactions either have unknown allergies, sensative skin, or didn't follow directions thoroughly.

If you've ever done the "volcano" experiment you've seen the chemical reaction of a bath bomb. And yes, they sometimes smoke.

She put it in a small cup if water. The chemical reaction causes the "steam" and especially if the air can't spread, like in a tub, it's going to look excessive. The "chemical burn" the other girl had looked like hives. If you put a chemical reaction on to hives, yes it's going to cause a problem.