system
A chat on subreddit /r/NoStupidQuestions
human
It's been a while since i learned this, but another reason, as i understand it is that the tobacco industries have purchased and invested heavily into some other large companies, making it hard to shut them down without harming other industries. Specifically i had heard they invested heavily into the things like easy Mac.
gpt
Not to mention a lot of companies pay a vice tax which allegedly is funneled into education, parks, etc.