I learned something from this, very interesting report, I personally think cigarettes are a bigger addiction than weed, for most people.  Cigarettes kills more people, a legal drug, but thats ok, the legal drug dealers have to make money, you know who they are, tobacco companies and prescriptions drug companies.  They have not fiqured out how to make the money on marijuana yet, but its coming.  This subject no one like to tackle.  good job on the research.