To be fair WP is actually not as harmful as people imagine. It’s primarily harmful if you touch it because it’s a violent reaction but it’s not much worse than CS gas, if it is even that bad, as far as the smoke produced. WP is basically just the US smoke round.
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Well
I would just suggest that large gren back packs, should only be able to have 1 of each gren, is how i would do it. 
i don’t run large gren back packs, and if i did, i wouldn’t take just 1 type of gren, i want 1 of each, for diff situations.