Hunger is your body telling you that your body is hungry, appetite is you conscious telling you aren't hungry, although you probably are
A lot of the army crew, if they have to make a trench they would have to send their men to the front line where there is gunfire.
Ill keep it short, if you dont want to do it, and or if it harms or degrades others. no
Tolerance can in fact cause an overdose, because the greater tolerance you can get the more of a certain substance your body will need eventually leading your body to take more than it can handle leading to overdose and death.