I've known several people who quit smoking, including my mother. She smoked for over 50 years, and then had her first heart attack. It was a "walking" heart attack, not the type where you immediately collapse. My older brother took her to the hospital and got rid of all the cigarettes in her purse. I returned an unopened carton to the store for a refund, and threw out all unused cigarettes at home that were left over from the previous carton. My mother was no longer driving, so she couldn't go and get them on her own, and none of us would buy them for her or take her to get them after she was released from the hospital. She needed an angioplasty, and the doctors kept her in the hospital several days longer than necessary for recuperating from that procedure, so they could keep her on strong meds while she went through the worst of the withdrawal symptoms. This procedure bought my mother another 10 years of life. Unfortunately 50 years of smoking had wrecked her body. She had everything you can get from smoking, except cancer, although she might have had that without anyone knowing about it. Her skin was wrinkled, she had emphysema, a heart condition, vascular problems, fluid retention, cataracts, memory problems, osteoporosis, and any thing else you can get from smoking. It causes or contributes to all of the things I mentioned, look it up if you don't believe me.
For your own sake, and that of your family, stick with quitting.
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If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau