Can elves die by being poisined???

[Tuor Turambar,Cursed by the Valar]

Yes, they lay down and die. Basically their spirit leaves their body.

Biological warfare would not work against elves, would it?

ie throwing a dead corpse into an elven fortification with a catapult.

But a poison, which dispersed through the air, would?

I just want this issue cleared up.