When they got into a high-profile ruckus with another Vancouver outlaw club called the Bounty Hunters, the Hells Angels shut them down. You're no longer on the street. You take whatever action is necessary. Or it can go to the extreme of eliminating them, which can involve fights or accelerate to bombings or shootings. Outlaw bikers tend to use hallucinogens such as LSD, amphetamines, and to a lesser extent cocaine, but even these drugs are the exception rather than the rule.
Patch holders use mostly marijuana, alcohol, and cigarettes.
Actually, among the Rebels or the Hells Angels, continued drug abuse, especially of heroin, is a patch-pulling offense. You lose your membership. When a member of the Rebels began to drink too heavily, his colors were confiscated and his brothers put him on probation. When a member is incapacitated in public, it exposes the other members and the club's reputation to outside threats, whether from the police or roadside vigilantes. There was very little pathology about it.