A study conducted with twins, cited in the text, found that early marijuana users were __________.

Name: A study conducted with twins, cited in the text, found that early marijuana users were __________.
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The study cited in the text found that early marijuana users were four times more likely to use cocaine later in life, five times more likely to use hallucinogens later in life, and two and a half times more likely to use heroin later in life. Therefore, the correct choice is D, all of the above.

A Study Conducted with Twins, Cited in the Text, Found