That is not what causes psoriasis, and if rubbing some oils on the skin were all it takes, don't you think more people suffering this disease would be taking those simple measures? To try to simplify a disease that causes such discomfort and straight up pain in such a manner is specious at best.
As a former sufferer of psoriasis I happen to know what I'm talking about....so maybe you could dismiss with the off-hand dismissals and offer a logical rebuttal as to why I'm wrong? I'm all ears to hear your scientific explanation of what causes psoriasis and how to cure it.
Oh wait, I know!! It must be the magic cannabis oil that, like holy water and colloidal silver, instantly cures everything it comes in contact with!
To turn your "logic" around: If rubbing cannabis on the skin and/or ingesting/smoking it were all it takes, after 10,000+ years of history with this plant don't you think more people suffering this disease would be taking those simple measures?
Here's a better test: does an alcohol-based cannabis tincture rubbed into the skin have the same effect as the oil? No, I guarantee it'd make the problem 10x worse.