"Natural" in an ambiguous that is impossible to define properly, yet it casts some morality on behaviour.

Anyway, the need for intoxicating itself seems to arise in more animals that have high developed cognitive abilities, Dolphins get high on passing around poisonous fishes, monkeys rub centipedes over their body and there are many more examples.

Mushrooms, smoking, fermented fruits and grains have been part of human lives for hundreds of thousands of years.

It seems that animals with high cognitive abilities feel the need to turn it off at times.