Hitler had some great nerve gas—but he never used them—even when he was in the bunker and about to be killed or captured. Rumors say he ordered V-2’s armed with Gas but they didn’t have it ready to drop on Patton’s Army—True? Who knows?
So, if Hitler, Mad as he was, didn’t use gas—the Syrian Tyrant will not as well.
History says he might. Everyone in this region has chemical and biological WMD's. Except oddly enough, for present day Iraq. Egypt used mustard gas and possibly nerve agents during the North Yemen Civil War. During the Iran-Iraq War, Iraq employed blister agents and likely also used nerve agents against Iranian forces. Shortly before war ended in 1988, the Iraqi Kurdish village of Halabja was exposed to multiple chemical agents, killing about 5,000 of the town's 50,000 residents. From Wikipedia. Also read somewhere that Assad's father is rumored to have used chemical agents. But they seem to be scrubbing the web of that info.