"I don't believe in magic", is a weak way of perceiving the world.
Just because you can't explain the science behind something, doesn't mean it doesn't exist. Nobody knows what "curses" are, because they can't explain the phenomena. There is a LOT in physics that remains unexplained to this day. If any physicist says they know what "light" actually is, they are lying, I don't care who they are.
The nature or reality is UNKNOWN. Most of what we know is guesswork, or close approximations, good enough for engineering purposes etc. Everything humanity has ever accomplished has always had a skeptic behind the scenes saying it can't be done.
Princeton University is researching something called "random event generators". It's what most people would call "impossible" or "magic".
Perhaps imagining a "curse" can play a role in its becoming real? I don't know. You don't know either. Anyone who says "curses" are 100% impossible or 100% certain is lying.
So how about we tell the truth, say "we don't know", and not push our luck?