We can draw parallels, but you've never developed lung cancer doom scrolling twitter.
If being a smoker decreases your life expectancy by 10 years and you live 80 years, then if you're wasting 1/8 of your day on screens (2 hours/day if you don't count sleeping 8 hours) then it's sort of like smoking, if we equate wasting your life with not living at all.
Even if we focus only on big ad-tech, many of the ad-based companies provide very useful products. That's why their business models work. Think google - maps alone is one incredible product or think Meta, Whatsapp has helped me save thousands of $ I would have otherwise spent on international calling, and I am so much closer and engaged to family and friends because of it, Martketplace has helped me buy/sell lots of stuff and saved me lot of money too. And the list goes on.
I do not disagree there are problems with these companies and products but its just simply incorrect to equate it to tobacco. There are tons of products that these companies make that are actually very productive and useful.