Poly Vinyl Chloride is a known carcinogen. Products containing PVC should be avoided, at the very least,by anyone who is in reproductive mode or expects to be in reproductive mode at some point in theirlife.
Most PVC products off-gas and can be irritating (to lungs, skin and brain functioning) when installed in aconditioned space such as a home. There are so many healthier floor options available that there is littleincentive to installing PVC based products in one's home.
I encourage you to search the Green HomeGuide data base for a wide variety of posts on flooring to determine which flooring materials might bebest for you and your home.
For more information:
Read "Can you give me information on Naturcor vinyl sheet flooring?" a Q&A answered by Molly McCabe.