I think you have a legitimate reason to be concerned. Especially if the guy knows where you live. I'd be concerned for my family with that being the case. Who knows what level of druggie this guy is. He might grow one plant for himself, or he might grow 1000 plants and be a dealer. Regardless, he's a lawbreaker andhas potential to be dangerous. Keep your doors locked and your guns loaded. Keep you and your family safe.