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Studies of PCBs in humans have found increased rates of melanomas, liver cancer, gall bladder cancer, biliary tract cancer, gastrointestinal tract cancer, and brain cancer, and may be linked to breast cancer

Smoking Addiction : The cycle of smoking addiction perpetuates throat damage
People who consume nicotine regularly have significantly fewer neuro receptors than those who dont

[13] Caustic drain cleaners rely on chemical reactions caused by hydroxide ions
