yall are some illiterate some bitches... I plainly said that the smell of the oil (aroma stimulus) and the actual needle (pain stimulus but it doesnt really hurt just kinda cool).... and also the short ester.. yes, short ester is key... theres a propionate ester in sustanon and that one releases damn near immediately after you inject it.They say a few hours but i feel lt sooner... lastly, yes, there is definitely a psychological component involved in this. All these things combined create a euphoric feeling and...