I would add a #3. 3. Counteracting the negative effects of other chemicals that are used that day. Any stimulant, whether its caffeine, amphetamines or pure a

I would add a #3. 3. Counteracting the negative effects of other chemicals that are used that day. Any stimulant, whether its caffeine, amphetamines or pure adrenaline causes anxiety. That anxiety increases with the dosage of the aforementioned substances; leading to an increased desire of ending said anxiety (b/c you know...no one likes anxiety).