Federal law forbids the carriage of hazardous materials aboard aircraft in your luggage or on your person. A violation can result in five years’ imprisonment and penalties of $250,000 or more (49 U.S.C. 5124). Hazardous materials include explosives, compressed gases, flammable liquids and solids, oxidizers, poisons, corrosives and radioactive materials. Examples: Paints, lighter fluid, fireworks, tear gases, oxygen bottles, and radio-pharmaceuticals.
There are special exceptions for small quantities (up to 70 ounces total) of medicinal and toilet articles carried in your luggage and certain smoking materials carried on your person. Electronic cigarettes are not permitted in checked baggage, however you can travel with them in your carry-on baggage.
Check with FAA for more info.