PVC: are we sure its the way to go

So if PVC is made up of 57% salt (chlorine) and 43% ethylene (natural gas) doesn’t that mean that there are a bunch of disgusting toxins that are created when the two of them are combined. When these two chemicals are combined is the only product PVC or what are the other products and what sort of damage are they doing to the environment. Is it really worth making this material or is it actually really harmful to the environment.
I notice now that PVC seems to be popping up and being used in almost everything, from fences to doors and windows to phones, dishwashers and furniture. I am guessing that there must have been some pretty extensive studies done on the affects of creating PVC in order for people to start using it in the creation of everyday item known to man. Apparently it is very energy efficient to make and to use. My concern is then that in a few years we will figure out after we have done some more extensive research that in fact there is some very negative disease causing chemical that is being created in the process of creating the PVC. At this point everyone will have come into contact with PVC at some point in their life and have some unknown disease eating away at their insides. Do we have all of the answers associated with Poly Vinyl Chloride?

Poly Vinyl Chloride Products

~Trevor