I'm working on a project about smoking any thing anyone knows will

Smoking can cause lung cancer, your breath will stink, and you finger nails can turn yellow

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)