White phosphorus smoke is not a weapon and certainly not a chemical weapon.
Jim and Emma both imply that it was used as a weapon on the palestinians.
Do you think the Israelis lack actual, effective weapons if they had wanted to kill Palestinians?
They are well stocked with seriously effective anti personel weapons.
The fact is that they needed smoke to protect their forces, and they themselves now acknowledge that it was wrong to use it in that area.
It was hamas fighters that chose a populated area as their battleground.