Cheetos is a food I learned to "just say no" to. Only made the mistake of buying anything but the smallest packages a few times. They were my go to junk food when stressed. I eventually switched to flavored popcorns. Not sure if that was healthier or not.
Potatoes were harder to give up. Growing up, we ate out once a week and had burger and fries, fish and chips, or pizza. Our after school snack was small packages of corn or potato chips. After dinner dessert was 1 miniature Hershey bar or 6 M&Ms.
Beverages growing up were milk, Kool-Aid, orange juice, Tang, Coca-Cola, Mountain Dew, or Sprite. As adults today, we drink water, tea, or coffee. Our son does too. Snacks are fruit, cheese or peanut butter, the latter formally on crackers. It seems like we're more savvy today about how marketing influences our eating habits, but perhaps not.