I really wouldn't count on any specials & discounts due to a mass exodus of smokers.
The whole cruise industry will eventually come full circle. Smokers will leave Regent for other luxury lines that have a less restrictive smoking policy. Non-smokers will then be forced to leave those lines beacuse the smokers will have become the majority. Regent will gain customers.
And although 23% of Americans smoke, only 10% are 65 and older, which would be the world cruise client base.
I believe the cruise lines will balance each other out regarding capacity & revenue.