Causes

Often the causes are as follows:

1. Curiosity: the young on their own initiative, by insistence of his friends or to prove something that is not, takes drugs and consume it.
2. Life circumstances: such as depression by a lost love, debts, school pressure and family problems or with the girlfriend and others aspects that affect in this problematic.
3. Pressure by others: people who are already lost in this terrible world of drugs almost always seek to involve to more people so that they become like them, frequently look to people weak and little temperament that already are the most easy to convince. 

http://www.youtube.com/watch?v=JBBBvT8Ll10