i also learned this this morning. please dont use pvc shower curtains! you will harm yourself! it is actually incredibly dangerous, the "smell" that comes from the pvc is actually about 108 different gasses that have been shown to: "PVC shower curtains contain many harmful chemicals, including volatile organic compounds (VOCs), phthalates and organotins. Toxic chemical off-gassing from PVC shower curtains may contribute to respiratory irritation, damage to the central nervous system, liver and kidney, nausea, headaches and loss of coordination."
if you would like to learn more about PVC and the damages it can do to you and the environment please check out this.
i seem to be pretty wordie this morning... huh.