Most common DRUG causing dependence?

ANS - A.Cannabis Cannabis- 9 million users,192 million users(Acc. To WHO Drug repo 2018)Heroin (opioid derivative) -2.5 lakh usersIt is estimated that 275 million people used illicit drugs, such as cannabis, amphetamines, opioids, and cocaine, in 2016 which translates into an annual prevalence of illicit drug use of 5.6%. Cannabis is most used with 192 million users. Some 31 million people who use drugs suffer from drug use disorders.-(WHO Drug repo 2018)