From time to time we get some flack for pointing out that as a "recreational" substance, marijuana is safer than alcohol. Anyone who doubts that claim might want to look at this new study from The Lancet, one of the world's top medical journals. Researchers reviewed information on deaths in three major Russian cities from 1990 to 2001 and questioned family members about the decedents' alcohol use, reporting the astonishing finding that "in several recent years, alcohol was a cause of more than half…