I smoked cigarettes (such a cute word, really) HEAVily from '73 to '82 and quit cold turkey (it's all we had way back when. That, or hypnosis). I had a Cuban in Vancouver, B.C. in '75. Was quite impressed. I will never go back to being a tabacco junkie. That said, I subscribe to a philosophy of moderation (except for carbs, dammit) so every time my wife & I have gone on a cruise -'93, '08, '13- I have brought a small handful of small, assorted Cubans back. I go through them about one per week or longer. When they're gone, they're gone.
No big deal. I do find a good cigar to be very pleasurable -I *like* a good buzz now & again- but they're hardly a problem. As for smoke in the lungs... inhale cuban smoke? What are you, nuts?