Board Thread:Off Topic/@comment-27447621-20160508230102/@comment-26397825-20160518014451

Yes. In real life they detonate upon impact with the ground, I believe, as you have to throw them with some force at the ground. Flour bombs are a messy version, since flour tends to cling to you, but you can carry them in a pouch and throw them as necessary.

They were used more for obscuring the opponents vision than for hiding your position, if that makes sense.