If that's the case, why is there any need for decontamination?
It also gets absorbed onto surfaces.
I was speaking relative to GD and VX, but ... to back up your point -—>
Sarin has a high volatility (ease with which a liquid can turn into a gas) relative to similar nerve agents, therefore inhalation can be very dangerous and even vapor concentrations may immediately penetrate the skin. A person’s clothing can release sarin for about 30 minutes after it has come in contact with sarin gas, which can lead to exposure of other people.[14] People who absorb a non-lethal dose but do not receive immediate appropriate medical treatment may suffer permanent neurological damage.