Smoking devastates heart health by inflaming arteries, promoting clots, and doubling heart attack risks, while heavy alcohol weakens the heart muscle, spikes blood pressure, and triggers arrhythmias—far worse when combined. Quitting reverses much damage quickly: risks halve in a year for smokers, and moderation restores rhythms. Prioritize cessation with medical support for a stronger heart. Act now to slash cardiovascular threats dramatically.