Marijuana is the most popular drug, followed by opioids, amphetamines and cocaine, Bloomberg reports. 

The most popular drug globally continues to be cannabis, with an estimated 188 million people having used it in 2017, according to the study. Cannabis usage is most prevalent in North America, where there are an estimated 56.6 million users, followed by Asia with 54.2 million. -Bloomberg

Meanwhile, the global area under opium poppy cultivation is the second largest ever estimated, after a record high in 2017.