If the classic rotten corpses - then nothing will happen, since there is no blood circulation and metabolism, respectively. If zombified living people, then perhaps only physiological effects in the form of changes in blood pressure, pulse, pupil size, and the behavior is unlikely to change, since it is controlled by the voodoo shaman.
He will eat it, together in your hand. And then it will move on to the brain. BRAINS ------------------------------------- --------------------------------------
If the zombies are dead, then no chemical reactions should take place in them (apart from rotting). This means that the question itself is incorrect and even the most vigorous grass will be like peas against a wall for them.
In the Nation Z series, zombie use of marijuana revived their consciousness.
Quote from the main character Doc:
"Damn, we don't need a vaccine. We only need billions of tons of marijuana!"
Marijuana - zombies will be more aggressive, as the craving for their "food" will increase. Cocaine may reduce appetite, but make zombies more aggressive. A sufficient amount of heroin will reduce the functions of a zombie, and it will even become peaceful and good for a while. In general, given that a fresh human brain contains neurotransmitters (in fact, the same drugs), then zombies are most likely the same drug addicts who blew the roof off and whose body has learned to pass the same dopamine into their brain (ordinary people will not be pumped from dopamine from the brain, as the blood-brain barrier does not pass it in its pure form, unlike dopamine-like psychostimulants). So it is quite realistic to substantiate the plot according to which zombies are "treated" by giving them drugs in pills with synthetic dopamine and other neurotransmitters.
Their brain is "rotten", respectively, dopamine and other hormones are not produced. This explains their eternal hunger, but it is strange then why in films they are able to smell and recognize the smell of blood.
In general, the living dead are dead, since they can walk, but there is no brain.
Nothing will happen;)
With zombies there will be whatever the writer of the script comes up with. And since the writers of books / films about zombies can come up with anything, then the answer to your question will be "anything".