"A new study in the journal Addiction finds that, after legalization, the use of marijuana among students at an Oregon college increased relative to that of students in states where the drug is still illegal. But, in a twist, the rise was mainly seen among those students who had also reported drinking heavily recently. The Oregon students who binge drank were 73 percent more likely to also report using marijuana, compared to binge-drinking students in states that didn’t legalize marijuana."  Clearly the legalization of marijuana makes it far easier for individuals, including those under 21, to get it.  It's not surprising that individuals who "party harty" on alcohol are likely to also include marijuana in their plans.  As time passes we will get a clearer picture of the impact of legalization.  It's a complex issue involveing both the "use" (negative side) and reduced previous enforcement/punishment issues (I'd say positive side)...like much of life..no easy answers.  Gary Crum