A limited blood supply and slow metabolism
Being a living example of a tobacco-free lifestyle can: all of the above.
All of the listed options is an example of a tobacco-free lifestyle. It could certainly prevent others from trying to smoke, convince others to stop smoking, and make others around you more healthy.
The ideal length of time for a cool down after an intense workout is about 3-5 minutes.
If you really want to they u should if not then don't