Mainlining is -
Most persistent drug abusers follow a classic progression from sniffing (similar to oral route) to skin popping (subcutaneous route), to mainlining (intravenous route) - each step bringing more intense experience, a higher addiction liability. With mainlining the initial 'thrill' is more intense.
Cocaine addiction
Homicidal cut wounds
Drug addicts using main veins for injecting drugs
Suicidal cut wounds
Drug addicts using main veins for injecting drugs