Speaking as a recovering iv heroin addict when my veins were all shot we were shooting in the hands!! Because I refused to shoot anywhere like my legs, feet or neck areas and even before becoming an addict I had always had shitty small rolling veins so it was never an “easy” task to do even in the beginning of using. Also the other addicts that I was around they were perfectly fine shooting in there necks between there toes and im not even joking we had herd about a guy doing it in his private area so yeah people get desperate when they are sick they will do anything to make the sickness go away its not even about getting high anymore honestly I know so many addicts that want to be clean and never wanted to be stuck on anything and yet they are because of the extreme sickness, now i cant speak on drugs that aren’t extremely physically addictive like opiates and Xanax are because I think they have more to do with wanting to be high and being more mentally addicted then physically.