Matter is never destroyed or created in chemical reactions. The particles of one substance are rearranged to form a new substance. The same number of particles that exist before the reaction exist after the reaction. The chemicals that you ingested have formed a new substance who have you think you have become, or are you under the illusion that those chemicals never changed you.
Because the human brain is so complicated and has little capacity to regenerate, it is vulnerable to the effects of damage, disease and addiction. Losing part of the vast network of cells, or changing the level of a neurotransmitter, can have devastating results. Alzheimer's and Parkinson's diseases are examples of disorders of the nervous system in which brain cells gradually die. In disorders of the mind, such as schizophrenia and depression, the symptoms are caused by more subtle changes in the brain that are as yet poorly understood. Heavy alcohol and drug use will have a detrimental effect on the mind.
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