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"One CN-DM Gas Hand Grenade"

That was a bad-assed gadget. The CN and DM were solids, vaporized by burning nitrocellulose propellant in the grenade. The vapors condensed into a sub-microscopic aerosol. This aerosol will penetrate almost all air filtration. DM is Lewisite, an arsenical compound, causing projectile vomiting and even worse unpleasantness.

In the old days CN-DM grenades were used a lot to get folks out of buildings when they didn't want to. Old movies showed tear gas grenades burning at one end, with a flaring fire. These movie grenades were training versions of CN-DM grenades. Nowadays police devices use volatile solvents as a carrier instead of heat vaporization, since folks are squeamish about burning houses down.