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Yes, it's true, and not only for the heart in general, but also for the body's ability to recover from stressful situations. When I was looking for information about the effects of smoking, I came across https://ways2well.com/blog/smoking-and-stem_cell-therapy-how-smoking-affects-healing-and-results . It explains how nicotine and other substances in cigarettes adversely affect blood circulation, vascular function, and the ability of cells to regenerate. This means that the heart muscle, which may already be weakened, loses even more of its ability to recover after exertion or ischemia. I have seen this happen to friends: more frequent shortness of breath, slow recovery after walks, and greater fatigue.