So your argument is that (1) since every drug/substance/experience affects your mind everything is the same, (2) consuming something does not create so therefore has no utility to anybody: the only utility is 'taking action'.
These points do not stand on their own.
Everything might affect your mind but that doesn't mean that every experience is the same.
Consuming something may not make a difference to other people's lives, but it might give direct utility to yourself (for example eating food, drinking water, reading a book, watching a film.) This article was about an increase in openness. If you become more open as a result of doing something then indirectly your future actions might hold more utility to the people that you affect.
These points do not stand on their own. Everything might affect your mind but that doesn't mean that every experience is the same. Consuming something may not make a difference to other people's lives, but it might give direct utility to yourself (for example eating food, drinking water, reading a book, watching a film.) This article was about an increase in openness. If you become more open as a result of doing something then indirectly your future actions might hold more utility to the people that you affect.