I think John Wayne died of lung cancer. He was a heavy smoker. Watch Hatari! sometime. In just about every scene someone is smoking. I think I once counted over 40 cigarettes.
Hatari, seen, but really paid little attention to the
cigarettes. McClintock is always beening shown, somewhere.
JW probably does the same in this production.
Do remember, way back when, he stopped, only because his
wife left him (due to his continued habit). He stopped for a time. Eventually, it
was reported cigs had found their way back into his life and
his wife, Pilar, left him once more.
Some old habits a bit harder to break than others.