To put it in perspective, anything you do/make/own that can cause damage to someone or someone else's property is ultimately your liability. an example is someone comes over to your home. They slip/trip on carpet, rugs, stairs, door entry way, etc. They can sue you (and win) because it happened on your property. same goes for anything you gift away whether or not you made it or bought it. It is a scary world. That being said, anything I gave away I would let the person know how you burn the candles and results you get. Let them know that longer burn times may generate different results and could be hazardous and either way it needs to be supervised.