Okay on the smoking -NO - he should absolutely quit.
Two stats -
1) people who continue to smoke decrease their survival rate by 30 % that's a HUGE number. Walking (exercise - like walking a dog) and deep breathing help. Most cancers like a hypoxic environment - less oxygen better chance to grow.

2) smoking takes up space in your blood that oxygen would occupy - healing requires oxygen

To continue to smoke is a BAD thing.

He has a good chance of survival assuming he does stop smoking and quickly follows through with treatment - ideally he should have jumped at the first surgical date - but that's a missed opportunity so a moot point now.

Ps smoking particularly if the dr knows he is still doing it - tells the drs... I don't care. So why should they put all that effort into healing someone who is working against their own survival. They'll never say it to you but they're human, and as such do make judgements.hugs