Are scratch n sniff stickers safe??


my son's kindergarden teacher has scratch n sniff stickers to give out to the class. There are some peanutbutter stickers (she gave tehm away to another teacher) but isn't sure about the rest. I contacted the company (creative teaching press)and found out they have not been sold by them for over 5 years so the store she purchased them from was caring very old stock.

Have any of you checked into these types of products?? thanks for your help joni