Yeah, though he quit decades ago (I think around the time of Trek IV), the long term damage was already initiated. Had he not smoked at all, odds are he still might be with us today.
It's certainly one habit of which I was "cured" years before I was potentially interested. As a kid around 5, maybe 6 years old, I simply watched as one of my maternal uncles "lit up". Noticing my rapt attention,, he thought it would be amusing to observe my reaction from taking a puff. He asked for me to approach and then placed the cigarette in my mouth. Silly me, I did as he asked. I thought I should "blow", which sent the cancer stick sailing. My uncle chuckled and said I needed to breathe "inward". I did and my asthma symptoms kicked me in the throat and lungs! Merciful Mogg did I ever suffer a coughing and wheezing fit! I suspect I was on the verge of puking. My uncle thought the escapade hilarious and heartily laughed at my expense! Smarmy b*st*rd! But the misery of that experience imprinted itself so deeply that I never, EVER had the urge to smoke! So, in retrospect, I should thank him.