To be fair there are people who believe in magic and people who practice 'spells', even if it may be less off a super magical Buffy-verse way and more in an earth-religion / hodoo / santeria type way.
And personally yes, I would guess that there are people who grow addicted to that. If you're convinced of something and if you truly believe it then I'm sure it is easy to get addicted to 'magic spells' from whatever alternative religion/ practices out there.
If it's a thing, then someones addicted to it... people get addicted to video games and other random things so I don't see why believers of magic would be immune to this.
🙂