Longest break was 10 months at 32. The death of my mother and I thought a cig would calm me. Soon back to pack a day.
After each failure to stop I'd smoke more. Even woke up through night for one or two. Was on 50 to 60 a day by 63 when hospitalised with pneumonia, bronchitis and pleurisy.
Also I was diagnosed with emphysema and told lungs so bad I only had a few years. I finally quit, started gym and lost 35 kilos. I'm now 71 and lungs are better than normal for my age but I avoid heavy city fumes, open fires & smokers, as I get coughing fits. Still on puffers etc for COAD.
I feel and look better than I have for decades. There is life after quitting - and it's great.