The Islamic State and its terrorist proxies would suffer if cannabis were decriminalized, Italy's top prosecutor argues.

In a recent interview, Franco Roberti also pointed out the links between the extremist group and organized crime in his country.

Roberti is Italy's anti-terrorism and anti-mafia chief, a joint portfolio that was created last year. He said decriminalizing marijuana - or even making it legal - would dent the illicit networks that profit from its sale and production.

The Islamic State, in particular, gleans money off smuggling routes from parts of Libya into Europe.

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