Of course he's a plant. You put some "pot-smoker" on a website with lots of conspiracy theorists and we all end up looking like nutters. People think we are a haven for druggies, malcontents, and the unemployed.
Come to think of it, maybe that means I'm a plant, since I'm malcontent and unemployed... But all joking aside, what real pot-smoker has to mention that he smokes pot in every single post?