And with coke (and meth or other stims), the "draw" is the dopamine. Coke is a dopamine reuptake inhibitor (makes your brain utilize dopamine more efficiently), whereas meth causes a huge release of dopamine.
Dopamine is a "reward" neurotransmitter. Imagine the feeling you get when you hit "21" playing blackjack, ofnthenfeeling afternsex, or the feeling you had when you finnished your homework in high school, or the feeling you get when you got a bonus check at work, or opening presents on Xmas morning as a kid (before you grew up and it became fucking stressfull), or biting into that first bite of some delicious sushi after you've been craving it for 3 days.... All those things cause a release of dopamine, imagine having the ability to snort some white powder and feel that feeling on demand, & multiply that by 10.
That's the "draw".
Like i said above, I never got that feeling from any stimulants.. However i did to a small degree when shooting opiates. Even when i was out of my stuff and couldn't get ahold of my supplier, just doing a shot drawn up from soaked, used heroin filters provided relief.... Even though the water in shot looked like 10iu coca cola diluted in 60iu water and contained maybe 10mg heroin, whereas my usual shots looked like used motor oil and contained 900mg heroin, just the act of the injection gave that dopamine release (dopamine is only a very small part of heroin addiction/high.. It has other actions)... Now I crave eating sushi more than I crave injecting something. BTW, Part of that feeling is the instant-gratification of injecting, snorting, smoking, or drinking something. You don't get that with pills, generally.