I've smoked for over 31 years at the time of writing, but I strongly don't recommend it, I've now got breathing difficulties at 48 years old which they suspect is
COPD that will gradually get worse and it's main cause is guess what, smoking. This is obviously just one likely bad outcome from smoking over time and smoking will also reduce your general health.
If you don't smoke, please please PLEASE don't ever start, it's effectively a massive multi-billion dollar scam. All the tobacco companies want is your money, they want you to get hooked and they don't give a monkeys about the adverse health effects as long as they can constantly recruit new smokers to replace the dead ones.
If you do smoke please do your best to stop, I know it's extremely difficult and it's something I haven't managed to do despite multiple attempts and with suspected COPD my condition will worsen much faster if I can't stop smoking (I am someone who gave up heroin and crack cocaine over 12 years ago and yet tobacco smoking still eludes me). I don't know about other countries, but there is a lot of support in the UK to stop smoking, including programmes where there's free patches and other nicotine supplements available, it still hasn't helped me stop, but it does help many others. Another possible alternative is vaping and this has helped a massive amount of tobacco smokers stop, although many doctors currently disagree with it because they say that the long term adverse health effects of vaping (if any) have so far not been proven. I will say however that vaping removes all the tar and the most dangerous chemicals that you get from tobacco smoking, so I strongly suspect that it's at least the lessor or 2 evils.