A new study has proven that the PVC in shower curtains is highly toxic. The PVC in most shower curtains and shower curtain liners emits harmful fumes including lead. These fumes can cause respiratory, reproductive problems or short out your nervous system. These problems have affected thousands of very young children, the elderly, and those with compromised immune systems. The results can be quite serious and with continued exposure those with already compromised immune systems, it may even mean death. Toss your shower curtains. When buying a new one, make sure it is not made from polyvinyl chloride (PVC).