CASAColumbia's 2012 back-to-school teen survey reveals that 86 percent of American high school students say that some classmates are drugging, drinking and smoking during the school day and almost half know a student who sells drugs at their school.

The survey also reveals that 52 percent of high school students say that there is a place on or near school grounds where students go to get high during the school day.

Thirty-six percent say it is easy for students to use drugs, drink or smoke during the school day without getting caught.

This year's survey once again looks at teen social networking and found that 75 percent of 12- to 17-year olds say that seeing pictures of teens partying with alcohol or marijuana on Facebook, MySpace or another social networking site encourages other teens to want to party like that.

Compared to teens who have not seen pictures on Facebook or another social networking site of kids getting drunk, passed out, or using drugs, teens who have seen such pictures are:

• Four times likelier to have used marijuana;
• More than three times likelier to have used alcohol; and
• Almost three times likelier to have used tobacco.

The CASAColumbia survey also looks at the impact of teens being left home alone overnight and parental expectations on teen substance use.

To learn more about Alcohol, Drugs and Youth, click here. For parents to Talk With Their Children, click here.