My hair is porous and very fine and I have to use a leave-in with slip. I also can't ever not use a leave-in. If I don't use one or use one without slip my hair snags and tangles when I try to put in my styling products and I can't get them distributed evenly. That will cause breakage when trying tp put in my product. My hair will also later dry frizzy.
"...just because you're paranoid doesn't mean that there isn't an invisible demon about to eat your face." ~Harry Dresden