A little advice for my dad.

Hey Trees,

Basically my dad and I smoke together daily and have been doing so for around 6 years and it really bought us closer. Unfortunately as he's getting on a bit he's starting to see the damage caused by smoking; knowing that he may have to quit soon is making him miserable, although i know dependancy isn't a great thing at all I know my dad and i know there's no way he'll accept that he should just quit. So i'm looking to find a decent alternative to directly smoking joints/blunts; we've tried edibles but he is not keen on it because of digestive issues.

Just wondering what would be the best alternative for him to still get that satisfaction of smoking while minimising the damage. Links to direct products great, we're based in the UK if that helps. Thanks in advance guys!