Get a hobby that requires a shed. Put a small tool shed on top of your cave entrance, put in a hidden locked trap door to your cave, insulate and aircondition the tool shed, vent out directly under your ac to hide heat signature, insulate your grow with IR block, camoflage your venting in the shed, actually work on your hobby in your shed and show your roommates the fruits of your hobby, keep your tool shed locked because of the tools for your hobby are in there, make sure you get a good sized carbon filter for the smell, and stop acting so paranoid.
