Allow me to ruin your day, even more: I worked seven years as a project engineer in the PVC industry. We had to take special provisions to preclude exposure to phosgene (not to mention VCM). With the tons of PVC available in packaging alone, the Iraqis could have obtained enough to create weapons. The chlorinated hydrocarbons in PVC and pesticides in any country with industry and agricultural as significant as Iraq is sufficient to produce enough phosgene to do serious damage.
Allow me to ruin your day, even more:
Allow me to further ruin your day, as you say. Show me a paper that documents these significant quantities of phosgene which can be generated from burning PVC that would be in such quantities as to be considered large scale enough for a full blown chemical weapons program. Lets see some numbers. You have real data, and not anecdotes to back up your claim, right?