Marijuana 3

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…the same things as cigarettes but usually in more concentrated. Five joints has the same effect on the lungs as a pack of cigarettes. This contributes to head and neck cancer in some people. Heavy marijuana use can affect the hormones in both males and female. That affects sexual characteristics and reproductive function. Smoking marijuana in heavy dosages may delay the onset of puberty in young men. Marijuana also reduces the sperm count in men.