Forty percent of high school students say they’ve smoked marijuana. Would you know if your child was using drugs? Learn the key warning signs you need to watch out for.

Click here to learn more about another dangerous substance: Bath Salts.

Want to know how to look marvelous without splurging so much? Dr. Oz invites three beauty experts to share the smartest ways to save money while looking fabulous starting from your hair and makeup tools to the beauty products you use.