I guess Barry should know.
Marijuana might be no more dangerous than alcohol, but it is not any less dangerous either.
Both impair judgment, and can lead to illogical thought patterns, as well as dissipate resources better utilized elsewhere. Their true cost lies not in the acquisition, but in the collateral damage from the effects of the slowed reaction times and misperception of the immediate circumstances. Both drugs feed into paranoia and clumsy uncoordinated actions, and slurred speech is only part of the problem.
Alcoholism and marijuana dependence are both preventable diseases.
And the treatment is identical in both instances - complete abstinence. There is never a surefire cure, short of that lifetime commitment.