They spent so much money erecting propaganda that marijuana was bad for you and actually bought doctors to tell you that tobacco was safe and healthy to smoke...they wouldn't DARE get into the marijuana cigarette business. I expect nobody will, as you are allowed to grow your own plants under state law.
The marijuana business will remain more-or-less the same (except the threat of being arrested for possession will be less or nonexistent).
I would rather that cigarette companies leave marijuana ALONE! If they get involved they will start doing the same crap they did with tobacco. Adding shit to make you addicted to it.
I like marijuana because if I don't smoke it...I don't care! LOL! The addiction level isn't as high as with other drugs. That's just my opinion.