Ya there is no way he smelled anything, must have all been in his head. I'm sure of it because last year, very stupidly, me and my friend would smoke like 6 bowls in my basement leaving one tiny window open for like an hour, and when we woke we couldnt smell anything. Also my parents had to work at like 8am and they didnt smell anything. And by the way for the future just smoke the whole joint, don't bother having a half smoked joint in your house because it will really make it smell.