About the previous note...
After a little thought, I come to a conclusion that as much as teenagers might know what is wrong, or right, there is still something missing, the strength to overcome a peer pressure.
I knew at that age that drinking hard liquor and smoking was wrong, in fact I knew it very well because I managed to conceal it from critical eyes of adults.
They were not the movies, or pop-culture, that influenced me. I think it was the immediate environment.

If the parents/guardians represent the essence of hypocrisy, if they give the child bad example, or no example, then the teenager will probably rebel against those hippocratic values.

There is nothing we can do to prevent child�s access to alcohol, smokes and drugs, there is nothing we can do about their sexuality, in fact, (in case the reader was raised under the rock, or forgot it already) sex is all the kids talk about from age of about 11-12 until end of high school. Analyzing that exposure bestowed on me, and my friends, some of us came thru the teenage years better than others, I remember couple of my (good looking) girl friends that went to the parties and managed to relatively stay sober and keep their virginity throughout the high school, the rest of us did not fare as well. The only differentiator was the value systems carried out of the childhood homes. For some it was just good parents, others were the mix of religious beliefs and a good example at home.

When we are young we have a very little appreciation for life and extremely shaky self-esteem, if we run low on it, whether it is good, or bad, we try we try to build it thru acceptance of peers, which prompts us to behave cool, and that usually is not equivalent to social norms of good behavior. The self-esteem, and strength to overcome the peer pressure, can be built by loving parents that adhere to the same principles, but really, who has got time for that nowadays?