Marijuana, as this article points out, can cause confusion, especially for those who smoke it.

It remains the gateway drug to cocaine, heroin, methamphetamine and other drugs and there really is no confusion about that.

It is also the gateway to drug rehab.

“A decade after voters in Washington state passed a medical-marijuana law, there is still confusion over how much marijuana patients can possess and how strictly to enforce the law, the Associated Press reported Sept. 20.

In Washington, the law requires that patients grow their own marijuana or find a caregiver who will grow it for them. The caregiver can only supply one patient with marijuana at a time. “

http://www.jointogether.org/news/headlines/inthenews/2009/washington-medical-marijuana.html