drink that contains a substantial amount of ethanol, a depressant which in low doses causes euphoria, reduced anxiety, and sociability and in higher doses causes intoxication, stupor and unconsciousness.

Tobacco would be the answer . good luck!

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)