Is this healthy for horses to eat?

My Thoroughbred mare is a chow hound (lol). After lessons I usually buy something from the stables vending machine like, Swedish fish,liquorish,etc and when I would would cool out my horse she would nudge me to share my Swedish fish and chips so I gave her a few and every since her favorite treat is Swedish fish opposed to (sugar cubes, apples,alfalfa cubes,carrots) I'm just wondering if its healthy to give a few snacks like that, Isin't it unusual for horses to eat stuff like that?