Editor: On Thursdays, from 2 to 4 p.m. at the Napa County Health Department on Walnut Street, California State Medical Marijuana cards are issued to people with a doctor's prescription. This card allows you to grow up to 12 immature plants or six mature ones. That is the state limit. Other counties, such as Humboldt, allow more. There are a dozen doctors in Lake County who write $100 prescriptions for the first year and $50 for each subsequent year for medical patients. There are also a number of dispensers in Sonoma County. Because it is legal, medical marijuana could also be dispensed in Napa County. [continues 165 words]