Most likely it's the smoking but I guess we cannot be 100% sure.

It's definitely not age. You don't go from being arguably the worlds premier rock vocalist to being a mediocre singer so fast. And Jon im afraid to say now is a mediocre singer.

It's very sad and it has had a huge impact on the band plus the music. They have to now write more conservative songs because of it. Also live in every other way Bon Jovi is a great act; so it's such a shame that Jon can no longer pull his weight.

Lot's of people are in denial about this; you will find plenty of people who still claim he is an exceptional singer and that his voice has just changed but it is still great, that it's bound to change with age etc...

THe other thing that bugs me is that nobody ever EVER seems to ask Jon about this in interviews. I am really curious to hear Jon's own explanation for his vocal detirioration but it seems to be a taboo subject.