I don't know about anything about "your body can assimilate marijuana as myelin mixed with polyunsaturated fats" part, but I do know that marijuana is very recognized for it's potential neuroprotective ability.

From the National Clinical Advisory Board of the National Multiple Sclerosis Society:

"An unexpected result of basic research, as well as some evidence from clinical trials, led to the discovery that cannabinoids may also reduce neuronal damage through acute or chronic mechanisms and promote synaptic plasticity, thereby possibly limiting disease progression, perhaps as an add-on
to other treatments.

In some ways this is even more exciting than its effects on symptoms such as pain and spasticity. Of particular interest, low chronic stimulation may be sufficient for neuroprotection, in contrast to symptomatic effects that typically require doses that are often associated with psychotropic effects. Similar results have been seen in a motor neuron disease model (amyotrophic lateral sclerosis), with less axonal loss in cannabis-treated animals."

http://www.nationalmssociety.org/abo...d.aspx?id=1023

Cherie