I have an e.e.g. in 4 days can i smoke weed ?

I wouldn't: I don't know for sure if smoking marijuana will definitely complicate the interpretation of an eeg by a neurologist. However, it could be logically concluded that since thc acts on receptors in the brain, acute intoxication may create electrical activity on the monitor which may yield a false-positive reading and compromise the diagnostic accuracy of the test. It may have to be repeated then.