Excuse me while I climb up on my soapbox, the better to deny something you're about to say, if you're a smoker. It is troublesome, temporarily unpleasant, inconvenient, even difficult. Slowly drowning from emphysema, on the other hand, is hard.
Lung cancer is horribly hard.
A massive heart attack is certainly no day at the beach. Neither is a stroke. Now, I'll leave to the pulmonologists that part of the lecture dealing with the disaster smoking is for your lungs, and to the cancer specialists the ghastly details of what it can do to your mouth, throat, esophagus, stomach, pancreas and bladder. I'll confine myself to what it's doing to your heart. When those blockages become complete, a part of the heart muscle will start to die, and you'll experience the crushing pain of a heart attack.