I assumed you meant it as an assumption because you said "If both of these are true". So, more precisely, your point was actually "anyone who had been feeling

I assumed you meant it as an assumption because you said "If both of these are true". So, more precisely, your point was actually "anyone who had been feeling strongly about it at some arbitrary point in time will have stopped using it by that arbitrary point in time". Yes, that's a bit easier to justify but still quite uncertain (IMO) and also a much weaker statement. Also, just because the stimulus isn't a molecule it does not follow that it's not biochemical in nature. Physics and biochemistry play a role all the way down. The very notion of "stimulus" depends on where we draw the murky, fuzzy and ultimately arbitrary border between "us" and "the world".