While they're used for plants that are meant for human consumption, plants are not normally touching the sides of the tent, are they? And even so, you wash fruits & veggies prior to eating them...at least you should. Just be careful not to "assume" it's safe. Even when you buy new clothing they recommend you wash it prior to wearing it, because the cloth has been treated with various things, yet most of us don't do that. Just want to be very sure with alternative uses, & for sure wipe it down first before using.
I just looked & found this (claim non-toxic):
http://www.growshopchina.com/sale-80...rial-600d.html