Gay Bomb

     Not sure if these break "the rules" when it comes to chemical warfare, but here's a story about reported types of non-lethal weaponry; investigated then dismissed by the American military.

from BBC:

The US military investigated building a "gay bomb", which would make enemy soldiers "sexually irresistible" to each other, government papers say.

The plan for a so-called "love bomb" envisaged an aphrodisiac chemical that would provoke widespread homosexual behaviour among troops, causing what the military called a "distasteful but completely non-lethal" blow to morale.

Scientists also reportedly considered a "sting me/attack me" chemical weapon to attract swarms of enraged wasps or angry rats towards enemy troops.

A substance to make the skin unbearably sensitive to sunlight was also pondered.

Another idea was to develop a chemical causing "severe and lasting halitosis", so that enemy forces would be obvious even when they tried to blend in with civilians.

In a variation on that idea, researchers pondered a "Who? Me?" bomb, which would simulate flatulence in enemy ranks.

Indeed, a "Who? Me?" device had been under consideration since 1945, the government papers say.

However, researchers concluded that the premise for such a device was fatally flawed because "people in many areas of the world do not find faecal odour offensive, since they smell it on a regular basis".

Brilliant ideas; all of them.