Wrong. The first is prescribed by a doctor and is highly addictive. That part you got right. Congratulations.
Cannabis, you're wrong on, though. It is prescribed by a doctor in growing number of states in the US, and I can't speak for outside of the US on that, so I'll leave that to someone who knows better (as far as I know, it may or may not be the case elsewhere in the world that doctors prescribe it). So, a little right on the first one there, but equally wrong.
As for addictive... Cannabis IS addictive. Psychologically for sure (you can be psychologically addicted to all kinds of things, though). Physically, despite popular, bullshit lies, you CAN be physically addicted to cannabis. Physical Dependence requires Tolerance and Withdrawal. You definitely get tolerance with cannabis, specifically because the receptors that the cannabinoids attach to begin to down regulate or stop functioning so that you need more cannabinoids to have the same effect. As for withdrawal, there is very clear withdrawal symptoms associated to stopping cannabis use suddenly: irritability, anger, aggression, restlessness, difficulty focusing, increased appetite, weight gain, sleep disturbances (insomnia, disturbing dreams, etc.), anxiety, depressed mood, cravings, sensitivity to light, stomach pain, increased sweating, fever, chills, and headaches, to name a few. In fact, because this has become accepted fact throughout the psychological and medical fields, they are adding official diagnosis of Cannabis Withdrawal to the latest diagnostic standards (mind you, they are also dropping the terms Abuse and Dependence and moving to simply Substance Use Disorders, with a spectrum of No Diagnosis, Mild, Moderate, and Severe).
Reputable facts are a good thing to know if you're going to make claims...