Being part of the drug paraphernalia category, bongs are illegal to import, export, and sell. However, possession of bongs is not an issue. Everything is fine if you do not break the federal paraphernalia laws. Bongs have been sold for tobacco usage, and vendors may sell them by advertising in that manner. However, it's advisable to keep the updates of your state laws as some states like Washington have banned the use and possession of bongs.