Why do some smokers stay healthy?

Could you elaborate on the reasons why some smokers manage to maintain good health despite their smoking habit? Is it due to their genetics, lifestyle choices, or perhaps a combination of both? Additionally, are there any specific strategies or habits that these smokers adopt to mitigate the negative effects of smoking on their health? It would be insightful to understand the factors that contribute to their resilience and how they can serve as an example or inspiration for others who are struggling to quit smoking.