According to the United Nation’s 2012 World Drug Report, 5% of the world’s population consumes cannabis.
The report indicates that in 2010 (the most recent data accumulated) up to 225 million people consumed cannabis – approximately 5% of the global population. In countries like America and New Zealand, the number is above 10%. The report states:
Cannabis is a truly global phenomenon. Reports on cultivation and seizures of cannabis and on sources of cannabis products illustrate that cannabis is not only consumed in all countries in the form of cannabis herb (marijuana), it is also grown in most of them.