That leaves the majority of cartel revenue still viable as long as amphetamines are restricted. Opiates are a rising profit center as DEA policy blocks branded opioid distribution equally to addicts and chronic pain sufferers.
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Parent describes legal marijuana businesses as targets for cartel violence because they do business in cash. Foreign cartels can't compete against local US gangs if that emerges as a racket. Also, it may become possible for mariguana businesses to use banks if cash starts driving crime. States may have to charter or run state banks eventually if federal officials continue to block the federal banks.
In any case there are no black markets as persistently profitable as the cartels' current drug business.
My suggestion was merely that I would be balls paranoid about security if I was tied to a dispensary in the US, no matter how legal, not because of cash, but because once one person uses that strategy (violence) they all will, such as how cocaine dealing became significantly more violent permanently once there was a wave of violence in the late 70's / early 80's.
Furthermore, one industry in which violence will prove to be an asset but hasn't yet had an opportunity (like the guy below me claims) is profit recovery from legal dispensaries inside the US. Dispensaries and their owners have huge targets on their backs.