Masturbation? No.

Becoming obsessed with masturbation to the point it's interfering with your life? Yes (obviously, I feel like at that point it's not even something to enjoy, and that there are plenty of other things that you could be doing).

Porn? Yes because does set unrealistic expectations when they take a lot of footage, splice and edit it. Then when you actually try having a sexual relationship with a person, it seems far inferior when you're used to jacking off while watching staged sex, a lot of times with freaky shyt literally no sane person you want to be sleeping with will do.