For thinkers only: Prohibition doesn't work, does it?

The advantage of ending censorship or prohibition is that the "" or "super cool" factor fades fast. Legalise heroin and let users sign a legal declaration that they are are addicts and watch the heroin rate initially rise and then eventually plummet.drop. Study the US alcohol Prohibition of the 1930s which resulted in organised crime, violence and killings. Shouldn't prohibition be limited to specific categories of citizens such as minors and felons?