When I gave up there's no denying, I put on weight. Always had a good appetite anyway, but giving up meant I could now taste everything properly.
Besides the benefits to the heart/respiratory system, he won't smell(well, not as bad until he completely gives up the nicotine vape), will have more money, more energy, will appear happier, more confident and have that smug, satisfied look as he sees all the 'snoutcasts' huddled together in their little shelters as the rain is coming in sideways in a howling gale!
What's not to like?