Is there anything that actually makes a person obsessed with another ?
Hello :)
So I'm trying to write about a character that is secretly using something to make a guy obsessed with her to the point he cannot be without her and it's working...
Something like a cigarette, an addition that you'd just need more and more of, but I can't think of a substance that does this powerfully in real life.
And it needs to be as close to reality as possible, or simply be true/factual.
And it also needs to be as secretive or hidden as possible so the guy cannot come to know but simply notices that he can't stay away from her for long periods of time.
Is there any ideas at all ? Thank you in advance :)