I do kind of wonder what the endgame of addictive product development is. I mean, if you assume that technology can both reduce negative side effects and make the product more-potently-addictive, absent some sort of social movement or something opposed to them, I would think that we would get closer to a point where there is stupendously-addictive stuff that has no intrinsic harm other than the addiction itself, but that the addiction could be crippling and extremely hard to kick.

Science fiction has explored the concept:

https://en.wikipedia.org/wiki/Wirehead_%28science_fiction%29

Wireheading is a term associated with fictional or futuristic applications of brain stimulation reward, the act of directly triggering the brain's reward center by electrical stimulation of an inserted wire, for the purpose of 'short-circuiting' the brain's normal reward process and artificially inducing pleasure. Scientists have successfully performed brain stimulation reward on rats (1950s) and humans (1960s). This stimulation does not appear to lead to tolerance or satiation in the way that sex or drugs do. The term is sometimes associated with science fiction writer Larry Niven, who used the term in his Known Space series. In the philosophy of artificial intelligence, the term is used to refer to AI systems that hack their own reward channel.

Wireheading, like other forms of brain alteration, is often treated as dystopian in science fiction literature.

In Larry Niven's Known Space stories, a "wirehead" is someone who has been fitted with an electronic brain implant known as a "droud" in order to stimulate the pleasure centers of their brain. Wireheading is the most addictive habit known (Louis Wu is the only given example of a recovered addict), and wireheads usually die from neglecting their basic needs in favour of the ceaseless pleasure. Wireheading is so powerful and easy that it becomes an evolutionary pressure, selecting against that portion of humanity without self-control.