Does anyone know the exact companies that test their cigarettes on animals?

Unfortunately I have only just now considered the fact that tobacco companies may be testing their products on animals, a form of animal cruelty that I am extremly against. In doing some research, I have found that all Philip Morris companies test on animals, including Marlboro, and my favorite, Parliment. In giving those up, I don't want to have to resort to American Spirits. Does anyone know which other companies do or do not test on animals, or just any other information on this appaling injustice?