Do the things at the checkout counter cause you to make impulse purchases?

Everyone who goes to Walmart or any other store has impulse decisions at the end of their shopping trip. Every time I go to Walmart, I use the self check out and I see the gum packs. I personally like to chew gum when I am stressed or know my day is going to be long. So to answer the question, do they cause me to make impulse decisions... Sometimes  However, I feel the little things that are at the end of the checkout line are little wants and not needs. I want that extra pack of gum so I won't "run" out, but I know I have plenty of gum until next week.