Alcohol, heroin, fentanyl?
What could go wrong?
Seems odd if he only had 1 needle wound. Would suggest he just recently started shooting the horse. Perhaps he was addicted to pills, but with the new policies on opiates found them hard to get and went to the streets for smack. Heroin has always been around but only recently have the pushers been adding fentanyl because it's cheap and much more potent. According to the TV shows, junkies don't want pure heroin anymore they all want the fentanyl laced stuff.
Worse, according to the TV shows, some dealers deliberately make some bags that are overloaded with fentanyl specifically because they want someone to overdose - because word of an overdose sends all the junkies to that 'good sh**' the pusher sells. Murder for profit. Scum dealers.
But who knows, maybe he was snorting it before trying the needle. Maybe he was murdered.