I think I would probably leave that for you to decide.
What I would say is that my understanding behind the precautionary principle is that if there is a risk of irreversible or serious damage, you actually don't proceed at all until you have sufficient information in order to make informed decisions.
What I would say on this one right now, with the lack of information...and you know, it's basic information: what are the chemicals used, and do they pose a risk?
Based on that, I don't think we have a full picture about what the risk could be.