rachamim18, I understood that. Rush has nothing to do with the duration of the high. Actually, I didn't even mention the rush in my post.
Administrations typically associated with more intense feelings and a rush generally have shorter durations. IV is *arguably* the same as smoked, which are generally shorter than snorted, which are generally shorter than if eaten.
However, I posted examples in my post about chemicals that follow are like that, and some that are not.
The only experience I have with H is IV'd, so I could not tell you how duration works compared to other methods of administration. However, I do know the experience is only 2 hours for myself....
And if your going to argue method of administration has nothing to do with anything, than simply comparing oral versus any other administration tells you outright your wrong.