Emma, read that story carefully and you will see that WP smoke alone was not an effective weapon.
They were firing it into defensive positions to force the fighters into the open .
The Israelis were using it to screen their soldiers. They have plenty of effective ways of killing. The wanted screening.

This whole debate was started by Jim saying the Israelis attacked civillians with chemical weapons, in an act of genocide.
That was a travesty of the truth.
Some Palestinians were killed and injured by Israeli use of a smoke screen.
We could all agree on that.