1) Consume external drug
2) Receptors downregulate (thanks to homeostasis)
3) Need more of said drug or withdrawals kick in (analogous to needing to take external insulin so body can get rid of excess glucose)
4) Rinse & repeat
From a United States perspective: What we have is a duopoly of Big Pharma and Big Ag that gets people hooked on sugar and then uses medicine-as-a-service to hook them on insulin forever. There is no money in preventative medicine.
There are other countries in the world that have already taken steps to get junk foods and sugary drinks out of the hands of children [0]. What excuses does the United States have?
[0] https://www.theguardian.com/food/2020/aug/06/mexico-oaxaca-s...