How can you stop drugs?

Because drugs cause you die, gradually.

Drug addiction is a very scary thing to get yourself into, and usually it is very difficult to get yourself out of an addiction. Whether it be drugs, pills, alcohol... all of the above have their own...

yes

Wasting time and throwing people in jail. It's another failed attempt at prohibition.

Yes, it is impossible. As long as there is a demand for illicit drugs, there will be a supply and thus the trading. Even the USA's DEA agrees that it is impossible to stop the drug trade.