Answer:
For one teens get addicted mostly through peer-pressure and two the brain becomes confused with whats wrong and whats right once you start and can't quit.
Answer by JKismyhusbandbae: Repeated drug use may lead to drug tolerance which occurs when a user requires larger amounts of the drug to achieve the desired effect.
Egyptian they were the first one who practice health care
<span>The correct answer is D. The US Food and Drug Administration examines many different substances and approves them when their benefits outweigh the risks. To be approved, manufacturers must prove to the FDA that their product is both safe and effective, so if the drug is ineffective, it is unlikely that the FDA will approve it.</span>
