The weird thing is that labeling tobacco as addictive did actually seem to produce a decline in use. Labeling social media apps as addictive has, from what I’ve seen, given a lot of people an excuse to keep using it. The narrative has shifted toward “It’s not my fault I use it so much, it’s the company’s fault for making it addictive!”.
Something about moving the locus of control to a 3rd party opens the door for people to forgive themselves for using it so much.
Obligatory “not everyone”, of course, but I can’t believe how many conversations about social media use will immediately shift all blame to the company and downplay any individual choices.