Richard,  Predictions are just that.  It will be seen as to whether they come true or not.  So I believe that an unseen future outcome cannot by definition be "substantiated".  

Yes,I do drink alcohol and smoke pot and experimented with other drugs as a young person.  I also had a successful career, pay taxes, volunteered in the schools and my community, started and ran my own business, raised children who are now professionals in their communities.......  I know many others like myself, so where's the damage in that?  A true conservative position would support the legal pot industry. 

BTW. Heroin is cheaper than legal pot in Alaska now that's something that is scary.