It is important to remember never use these logs on flammable items such as furniture, floors or any other surface with paint or varnish. It is also not recommended to use them indoors as the products are very dangerous when inhaled and can be harmful even with just a few minutes of exposure. If you have an open fire, it would be wise to wait until everything has cooled down before using this product on your fireplace or any other area that was used for burning. If the creosote residue is left inside the chimney it can lead to a dangerous situation.