Marijuana makes blood rush to the head
`Smoking marijuana can affect blood flow in the brain so much that it takes over a month to return to normal. And for heavy smokers, the effects could last much longer, a new study suggests. [..]
People who smoked cannabis had higher blood flow through their brains than non-users. Yet there was also greater resistance to the blood flow, suggesting that cannabis changes the blood vessels in the brain in a way which hinders oxygen in reaching the tissue effectively. In an attempt to compensate, extra blood is sent to that part of the brain, increasing resistance but probably failing to get enough oxygen through the vessels, Cadet suggests.’
