Aspirating is a very useful technique... but not foolproof. Chances are most people will have a hard time keeping the needle steady while shooting themselves. If you move it in or out, you risk getting that oil into a vein. I the claims of people dying or having a stroke after shooting into a vein are vastly overexagerated. Most of the spots we shoot in are relatively safe.
If you go through a vein and out the other side, that oil is still gonna be pushed into the hole in the vein... and you're gonna have it leak into your blood. Evidence for that is when you stick a 1.5" pin all the way in, shoot, pull it out and still get oil beading up on the surface. If there's enough pressure to push it that far out... then there's definitely enough pressure to get it into a vein.
Most of you have experienced this at one time or another. You'll feel it when it happens.... especially with gear that has high BA content (fina cough, etc.... which by the way can happen with any gear, not just fina. It's a function of BA content not the fina). You may get a bit light headed or dizzy, and many times you can taste the gear/oil just as well as if you had gotten some into your mouth somehow.
Most blood vessels in the delts or traps or lats are too small to carry any significant amount of oil. If you were to shoot directly into it, you'd just rupture the blood vessel. The oil is too thick, tends to stick to the walls of the blood vessel and slows blood flow dramatically... so with one pump of the heart, the vessel would just rupture. That's why you end up with post injection soreness even after a nice slow, low volume injection most times.
Either way... it's a good idea to not shoot into veins. Heh. Aspiration is a good idea. So keep doin it. And yes... if you do get blood in the syringe, there's nothing wrong with shootin it back in. Just find a new spot and go for it.
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