Chemical Warfare

Chemical warfare is the use of toxic chemicals as weapons, poisoning rather than blasting the target. It occupies a peculiar moral and legal category: banned by treaty, stigmatized like almost no other weapon, yet technically within reach of any state with a chemical industry. The gap between how easy chemical weapons are to make and how rarely they are used says something about the strength of the taboo around them, and Syria's willingness to break it says something about the taboo's limits.

The agent families

Chemical agents divide by how they kill. Nerve agents, sarin, VX, and the Novichok class, disrupt the nervous system's chemistry and can kill in minutes through skin or lungs, the deadliest category and the one behind Syria's 2013 Ghouta attack and Russia's assassinations. Blister agents like mustard gas, the signature horror of World War I, burn skin, eyes, and lungs, maiming more than killing. Choking agents like chlorine and phosgene attack the lungs directly, and chlorine's dual civilian use made it Syria's deniable weapon of choice. Blood agents like hydrogen cyanide round out the classic list. What unites them is that protection is possible, masks and suits work, which is why CBRN defense exists, and why chemical weapons terrorize more than they achieve militarily against a prepared force.

The ban and its stress tests

The 1925 Geneva Protocol banned use after WWI revulsion, and the 1993 Chemical Weapons Convention went further, banning development, production, and stockpiling, and creating the OPCW to verify destruction. It worked to a striking degree: declared stockpiles were eliminated, including the last US chemical weapons in 2023 and most of Russia's declared holdings, and the OPCW won a Nobel Peace Prize. Then Syria tested the whole edifice. The Assad government used sarin and chlorine repeatedly against civilians, a 2013 deal stripped its declared stockpile, and attacks continued anyway, exposing how a determined state can exploit dual-use chemicals and a verification system with no enforcement teeth. Russia's Novichok assassinations added state-sponsored chemical murder to the ledger.

Why don't more militaries use chemical weapons?

Because they are militarily mediocre and politically radioactive. Against trained troops in protective gear the effect is degradation, not decisive destruction, and weather makes them unpredictable, gas drifts back on the user. Meanwhile the taboo turns any use into a strategic liability that can trigger intervention or sanctions. The combination, low military payoff, high political cost, keeps most actors out, and the exceptions are regimes using them against defenseless civilians precisely because that is the one scenario where they work.