Some are comparing the use of marijuana vs. alcohol as a better choice of drugs for young students.
What they fail to understand is, we're compounding on an already drug infested society, the pressure that the young exert among themselves to try the latest  mind altering chemicals available in the market. Many will be adding, not substituting, alcohol use with the use of weed. Even if some don't, it's much easier to smoke a joint during recess or before school and enter the premises  all high. The rhetoric that they're already doing so is invalid since now they will 'legally' be high in the school, perfect excuse.