Like the drug economy?
And I'm talking about dealing drugs, not about smoking a joint which is socially acceptable in many places.
"The United Nations Office on Drugs and Crime's World Drug Report 2005 estimates the size of the global illicit drug market at US$321.6 billion in 2003 alone. With a world GDP of US$36 trillion in the same year, the illegal drug trade may be estimated as nearly 1% of total global trade."
https://en.wikipedia.org/wiki/Illegal_drug_trade?wprov=sfla1