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accidents acid activity addiction adults alcohol American amount amphetamines arteries barbiturates become behavior birth blood pressure body calories cancer carbohydrates cause cells cervix chemical child cholesterol cigarette cocaine consumer death depression develop diet disorders drinkers drinking drug abuse eating effects elderly emotional endometrium example exercise factors fallopian tubes feel female glands gonorrhea heart attack heart disease heroin homosexual hormones hospital immunity increase individual infection intercourse lives lung cancer lungs major male marijuana marriage mental health methadone million muscles normal nutrients nutritional obese occur organs orgasm ovum pain parents patient penis percent person physical fitness physician pollution pregnancy prevent problems produce protein psychological recessive gene response result sexual sexually transmitted diseases smoking social Source sperm stage stress substances symptoms syphilis therapy tion tissue treatment United usually uterus vagina vitamin weight women