What if a 90+ kg. man, whom had smoked for 15+ years, suddenly stopped smoking altogether? What are?

I assume you mean the coping up stages when he puts an end to his smoking habits. Usually, the withdrawal stages will be challenging. It's like a part of you will be ripped out of your system. And for someone who has been smoking for 15 years, it's a pretty hard thing to quit it actually. But you can try it bit by bit. The stages of withdrawal would include being you hungry all the time, being irritable and out of energy. Lots of people like from acuquit.com.au usually feel pain as they remove smoking out of their system. So it's a tough challenge for hardcore smokers to quit their habits. But if aided with willpower and convincing from friends, then most likely they'll have a chance.