I have heard this a million times. "I wish that I would have never picked up the needle". I'm not knocking those that do at all. Not only are there tolerance and od issues. You will eventually make your veins collapse with prolonged use. I have a buddy who can only go in his neck because everything else is shot, no pun intended. Most people start orally, then they go nasally. then that doesn't work that well so the next step is the needle. Also, if you do IV. don't use your feet. Blood clots can form very easily if its done this way.