It's no joke starting to smoke at my time of life

"Medicine won't help you at all", the doctor told his patient.
"What you need is a complete change of living. Get away to some quiet country place for a month. Go to bed early, eat more roast beef, drink plenty of good rich milk, and smoke just one cigar a day."

A month later the patient walked into the doctor's office. He looked like a new man, and the doctor told him so.
"Yes, doctor, your advice certainly did the business. I went to bed early, ate more roast beef and did all the other things you had told me. But, doctor, that one cigar a day almost killed me at first. It's no joke starting to smoke at my time of life."