True or false tolerance to narcotics doesnt occur until after several weeks of use

The statement above of which the tolerance to narcotics will not occur until only after the several weeks of use is false. It is incorrect because when narcotics has been consumed, it does not occur after several weeks. It occurs after one or two weeks after it has been consumed. It does not take long to occur.

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)

Olfactory epithelium i believe