On the one hand, as a species we have a history of zealously promoting puritanical, oppressive policies, and have a history of using 'treatment' and 'medicine' as covor to commit atrocities, as a whole and just in recent American history (ex homosexuals being shot up with Apomorphine, electroshock therapy, etc, the use of Sodium Amobarbital and related drugs like Thiopental as 'truth serums'/confession inducing drugs, various unusual chemicals forced onto incarcerated addicts [like the MK-ULTRA studies done in the Lexington Narcotic Hospital in the '50s, most notably telling addicts in for treatment that a new drug to treat addiction was being tested on them, when in reality they were being used by the feds as gunea pigs for hallucinogenic experiements, like the group of black detoxed former Morphine addicts who were injected with Iboga alkaloids). Hell, we use them in the 'extraordinary rendition' program, Barbiturates injected into supposed terrorists to make them easier to subdue and kidnap when legal channels are out of the question. Plus, habitual sex offenders are given sentances involving involuntary chemical castration (massive doses of Estrogen like hormones).
But, I seriously doubt a drug to suppress Cannabis intoxication would ever be used, at least not in any Western country. Most of the West is centre-right as far as majority politics, but for the last 40 years attitudes towards drugs have continued to soften, even in ultraconservative areas.
There is work being done on 'vaccines' for Cocaine and Heroin addiction; Time magazine ran a covor story about it several months ago. An infant would be given the vaccine at the same time as other inoculations, and it would prevent them from ever experiening a high from Cocaine or Heroin if they were ever taken, thus preventing addiction. However, even this will most likely never get widespread use due to the growing anti-vaccine movement and civil liberatarian legislators. This is assuming the technology ever bares fruit, and can meet safety standards.
Eventually, society will go back to the days where drugs are all decriminalized, if not outright legalized. Europe is already setting the stage, it won't be too long.