I have a few used Yankee Candle glass bottles. I am wondering if I can use them for storing honey or other food items?
Assuming they're just plain glass (not leaded glass or painted) they should be fine as long as you remove all the wax and wash them thoroughly first. Plain glass is always food safe. In fact, it's so widely accepted as food safe that I can't find good sources saying so.
Just make sure the washing is thorough using hot water and a strong detergent since coatings are sometimes applied to glass jars that aren't intended for food storage. I would put them through a dishwasher cycle.
Consider the lids also. Those may have liners or seals that aren't food safe.