I think retailer's liability here is also limited. Imagine you are a shop selling cola in can. If coca cola company put some unhealthy stuff in, you are not l

I think retailer's liability here is also limited. Imagine you are a shop selling cola in can. If coca cola company put some unhealthy stuff in, you are not liable just for selling it. But if you made the stuff unhealthy because you stored it in direct sunlight long time, you are liable.