I had a homemade edible once and was explicitly told to take only half because it was strong. It had 0 effect. Years later I visited Amsterdam and decided to try again. The guy told me to only take a quarter for starters. I followed the instructions, but again felt nothing, so I ended up eating over half. Well, this time it actually did work. Awful experience. I was blacking out, super paranoid, super nauseous and dizzy. 0/10 would not do again, lol.