http://en.wikipedia.org/wiki/Gateway_drug_theoryFurther research has shown that people with a disposition to resort to cannabis use are more likely to live longer and healthier lives than users of other "social drugs" such as alcohol.[19]
If word of this gets out Social Security will be in even bigger trouble than it is now. OTOH medical costs might be lower.
And then there was the study showing that in pot legal states traffic fatalities declined 9% directly attributable to substitution of pot for alcohol. They looked.
Report shows fewer traffic fatalities after states pass medical-pot laws - The Denver Post
If I believed in passing laws to solve social problems I might suggest banning alcohol and making pot available over the counter at the local quick mart. Fortunately I believe in letting people decide what they want to do for themselves.