“California voters passed Proposition 215, the nation’s first medical marijuana initiative, in November 1996.
The issue received intense press coverage and California’s teenagers got the message: their past-month marijuana use increased by nearly one-third that year, from 6.5% to 9.2% according to the National Household Survey on Drug Abuse.
Although use declined the next year, it has increased every year since then. The figures are 1995–6.5%, 1996–9.2%, 1997–6.8%, 1998–7.4%, and 1999–8.4%.”Feb. 22, 2002