So I injected meth into the vein below my middle finger on my hand. I registered and injected slowly making sure to take into consideration the size of the vein and the blood flow speed. I continue to ensure I was still in the vein while slowly injecting being careful not to blow the vein. My hand is not swollen nor does it hurt. However my fingers are pretty cold and slightly numb. I didnt miss and I experienced no pain while injecting despite the slight warning sensation travelling through my vein from the meth, which always happens. What could the problem be? I used a brand new rig as well.