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Coffee messes up your teeth. Not only stains them but also demineralizes them and if you take it every day for years they will become brittle and begin cracking.
Coffee messes up your brain. It spikes cortisol for up to 18 hours and prevents any decent sleep. With enough years of bad and insufficient sleep it will cause you brain damage and make you insane. Caffeine addicts are zombies.
Coffee messes up your guts and digestive system. It will cause stomach ulcers and lowers acid production, preventing proper digestion and absorption of nutrients from the food you eat.
Coffee messes up your hormones and heart. Prolonged use (as in every day) causes adrenal fatigue and makes your heart suffer.
Whatever bad symptoms you get from stronger stimulants you will eventually get from coffee anyways. They're the same thing but coffee creeps up and leeches the life of you instead of taking you in one blow.