Two things today. First, lemon might seem like a nice, refreshing scent. And sure, maybe it is. But, go home, and rub a bit of the outside of the lemon on your hand. Don't clean it immediately. Smell your hand. It won't smell nice. Yeah, it's lemon... but it's not nice.
Secondly, want a posture tip? Your ears should be over your shoulders, particularly if you sit at a desk all day.