No I am sorry, but use of chemical weapons by Assad was entirely predictable to produce the retaliation which took place.  Thus he would not do it without being insane which is not likely.  The rebels have many means of using chemical weapons if they want to.  Rockets and artillery are just fine to deliver tactical doses of chemical weapons.  Looking from the big picture, Assad had nothing to gain.  Despite emotional reaction focused on chemical weapons, conventional bombs, do tremendous damage and kill lots of people.  Chemical weapons have the disadvantage of leaving buildings, weapons, infrastructure undamaged.  Assad cleaned out his chemical weapons.  The killer rebels did not.  Intelligence seems to agree that the Syrians went after an ammo dump which the killer rebs had located near civilians.  It is reported that the conventional bombs that took out the ammo dump released toxic materials stored there.

It is best not to buy the propaganda.  CW offered Assad no profit.