For an immediate boost in sales of any edible item you sell in your newsagency, offer a sample to taste. Chocolate shops do it. Fudge shops do it. Ice cream shops do it.
While I have seen newsagents offer tastings, it is usually for premium or new lines. My marketing tip today is to do this for everyday candy. Test it with a Mars Bar. Cut one up into small pieces and offer a tasting. Executed well, this should lead to impulse purchases.
Work your way through the chocolate bars and, hopefully, help your shoppers reconnect with your candy lines.