I started smoking my freshman year in college at age 18. I smoked one memorable (and disgusting) cigarette before then.
I ran cross-country in high school and was an avid runner, mediocre but enthusiastic basketball player, and overall fairly physically fit prior to becoming a smoker.
As I started to smoke in college , I found it gradually harder to run for endurance, stay physically active, etc. and I became a lot less athletic as staying physically fit slowly became less of a priority.
Smoking robs people of their quality of life in so many different ways.