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Up to 41 distinct chemical species in 5 different categories (ie, sternutating [respiratory irritant], lacrimatory [tearing], pulmonary [choking], vesicant [blister], and systemic [blood] agents) were used on battlefields between 1914 and 1918, although most of the damage was limited to chlorine, phosgene, and sulfur mustard.
This happens despite the cluster being thirteen times larger than a single bromine atom and despite aluminum being nothing like the lacrimatory poison-gas staple.
Anisomorphal, the potent lacrimatory agent produced by the two-striped walking stick, Anisomortha buprestoides, also seems likely to have trigeminal activity.