Large companies are always slow to adapt to technology changes. I don't think their current corporate mandate is to try to develop Very Low Nicotine cigarettes, PERIOD. so end of discussion for now.
They will wait and see what FDA says before changing corporate directions. The executives DO NOT want to take risks, they woud rather pay a huge sum of money later and be right. I mean really, 1,2 or 5 billion, it doesnt matter, as long as they are right. Just not enough things have developed yet.