Drugs and alcohol in teenagers

The majority of teenagers have some experience with drugs and alcohol.
Some of these teenagers only drink or take drugs occasionally in parties for example. Others become addicts for example tobacco addiction and the last group and the smallest is the people who become dependent of this drugs. If they don't take the drug one day they become crazy.
In Spain tobacco, alcohol and drugs you take for heath are legalizated.
The drugs:

• crack
• marijuana
• heroin
• LSP
• speed
• PCP 

Are forbidden to sell and take.