Crispi is right on the money. As usual. Don't use illegal words. Don't admit to growing pot. 'Tomatoes' is nearly cliche' as a code word for pot in a hydro shop, as is 'medicinal herbs'. The shopkeeper won't discuss anything technical with you if you go in and ask about pot, because he's worried that you might be an undercover trying to nail him. It's all so silly I know (prohibition would be silly if it weren't so tragic in so many ways) but those are the silly rules we have to play by until the laws are changed.
Go vote, then you can talk about pot all ya want lol!