Let's be smart here. ALWAYS burn your candle within sight. Trim wick to 1/4" for each lighting and keep candle free of any foreign materials.
Allow the melted wax to reach the edges on each burn to avoid the build up of wax on the jar and prevent tunneling.
Never burn for more than 5 hours at a time. Never handle a recently extinguished candle, allow the candle to cool before handling.
Keep away from drafts, kids, pets, and other flammable objects.