Mr.Scagnattie
Bluelighter
You always shoot towards your heat, with the direction of the blood flow. It has to go to your brain.. that's how you get high, not sending it into your fingers. So, yes, you always 100% IV pointing inward. You're right, that blood flow goes in a circle, but you shoot up in a vein because it is the veins that carry blood to your heart, and arteries that carry blood away.