it would appear that THC both protects and is harmful to the brain, preventing alzheimers yet capable of causing neuron cell death & other related side-affects. [second source] goes on to explain that certain anti-inflammatory substances such as aspirin or vitamin E protect against the neuroxtocitity of THC.
ginger root does the same thing as aspirin (almost Is the same)
"Neuron death induced by THC was inhibited by
nonsteroidal anti-inflammatory drugs, including indomethacin
and aspirin, as well as vitamin E and other antioxidants." 
before you get high, get your nutrition right
[*1] jneurosci org/cgi/content/abstract/21/17/6475
[*2] druglibrary org/crl/neurological/Chan%20et.al%2098%20Neurotoxity_%20JNeurosci.pdf
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