The phrase "slight addiction" means having a small or mild dependency on something, like a habit or behavior that is difficult to stop but not very severe. Full definition
As I've shared before I may have a slight addiction to cooking magazines. (lemonythyme.com)
I used to have a slight addiction to that nasty junk foody jarred queso dip — but this has to be better because it's vegan and doesn't have sodium benzoate. (isachandra.com)
I am started to develop a slight addiction to Greek yogurt — I've been putting that shiz on everything — well, almost everything! (foodfaithfitness.com)