Yes, it is exemplary because smoking can damage health, especially the lungs which will be fatal if it is severe and even leads to death.
diverting cigarette-buying money to invest in bitcoin is a very good option, it doesn't matter although the OP can only generate a small amount of bitcoins each week and will be a lot in the long run if you do it regularly every week.
This is a very good example, but it is very important whether a person was able to completely quit smoking, or is looking for a replacement for cigarettes. You can quit smoking, but will instead eat a lot of sweets to compensate for the constant craving for smoking. This is what my friend does, he eats a lot of sweets and I don’t know if he can save money.

But in any case, quitting smoking is very good and investing in bitcoin is a prospect for the future, which will bring results.