I just went back and re-read your thread about not being addicted to IV coke.
When I started using IV coke back in 2001, I started with a smallish amount, say 50-100 mgs. at a time. As my appetite for IV coke grew stronger, I increased both the amount and quality of the coke I was shooting. I had found a source for high-purity washed coke and was shooting 250 - 300 mgs. at a time, and would actually enjoy shaking on the floor with a complete loss of motor control for 10 - 20 minutes, depending upon the dose and amount of time since my last shot. I was deep into addiction at that point, and in a death spiral, knowing that it was only a matter of time before the next shot would kill me.
I went to a 28 day rehab in 2006, and have remained mostly clean since that time. I currently have 3 1/2 years of continuous sobriety.
I'm telling you all this because if the effect you are looking for is the effect I was looking for, you are on a very dangerous path. Everyone has a different tolerance, and your limit is likely to be different than mine, but it's easy to get sucked in at higher and higher doses, because it feels better and better until it doesn't - which is a place you don't want to go.
Be safe. Have fun.
FC