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yes
anything that hurts you or someone else without any potential benefit is a sin
porn addiction fucks with dopamine levels and creates dependency/addiction which just gets worse over time and snowballs to more degenerate porn. you become lazy and bored because of it and inversely very angry if deprived of it which could lead to you hurting others.
it also fuels an industry of meaningless disease spreading sex, which is explicitly described as sinful
that being said men have hormones and have to wank sometimes just to function. if you really must, look up some nude female models on deviantart and use your imagination for the rest. even then limited exposure to the material is ideal if you are using it for sexual relief.