It's pretty widespread amongst young people who pay about £40 for a gram of something that is probably 1% cocaine. The problem isn't going to go away and it isn't going to any time soon; humans have always and always will want to take mind altering substances.
It's far better to legalise/decriminalise and hand control over to the state. Prohibition has caused the creation of the 'legal' high market.
* awaits the backlash from the 'cannabis turns people into terrorists' crowd.