Drugs lead to delinquency (crime) and madness. Depending on your view that is what some might say drugs do.
Since the OP said they had to block chess because of phone addiction, the joke is just replacing drug addiction with chess. Chess (drugs addiction) leads to delinquency and madness.
Since the OP said they had to block chess because of phone addiction, the joke is just replacing drug addiction with chess. Chess (drugs addiction) leads to delinquency and madness.