Fuck you sound just like my paranoid best friend ... No dude the reason people burn veins out are these : using the same one over and over you have to switch they're not meant to be re poked where a hole was formed earlier and hasn't healed, they usually use the same needle on average 5-20 times the same one ask anyone here , they never use alcohol swabs after to clean sterilize , no lotion care at night hours after shooting up, and also one big factor I had a friend that him and I started shooting same time same dope same amount no joke for 6 months straight. He lost 6 veins almost had no where other than jugular , me? All of mine still here even after mixing with Coke speed balling and 3 years straight IV cause I also jog and lift to build veins and keep vascular system healthy I also drink tons of water which most junkies don't do which helps your veins stay hydrated and high PH I think that should answer it. My friend thinks I'm dumb for shooting powder blk "cause I'm shooting dirty Mexican fecal matter " he's never been addicted he doesn't know he thinks you have to do China and pure liquid h to have healthy veins, not true if you use old rigs ur addicted and you don't do what I said above even with 100% purest on earth H youll have collapsed veins, welcome.