The number of times I've wanted to find a non-harmful way to prove that point (smoke grenades come to mind)... but the risk to me is not worth it, and all it wo

The number of times I've wanted to find a non-harmful way to prove that point (smoke grenades come to mind)... but the risk to me is not worth it, and all it would do is introduce some sort of pre-security screening that completely fails to solve the problem.