I dunno--of all the AI based products coming out, the whole "AI girlfriend / AI boyfriend" thing bothers me the least. If someone can afford it and they want a play relationship with a computer, then I don't see the harm. It's probably safer, better and healthier than many real-human relationships are. If they're getting what they need out of the computer, who are we to judge?
I would change my opinion if it could be shown to have the negative physical harm that your cocaine example implies.
I would change my opinion if it could be shown to have the negative physical harm that your cocaine example implies.