Is cocaine and oxycodone abuse more addictive than marijuana abuse?

In Children’s Aid Society of Algoma v. L.P., 2011 ONCJ 712, the applicant society sought a status review of a child protection order. The children were in foster care. The children’s mother had a serious, longstanding drug addiction; the father was a heavy user of marijuana, and also abused cocaine, crack cocaine, and oxycodone. In deciding against returning the children to their parents, Kukurin J. took judicial notice that both cocaine and oxycodone “are very addictive narcotics, much more so than marijuana” (para. 79).