According to the Critical Thinking Box on Smoking and Psychological

According to the Critical Thinking box on smoking and psychological disorders, some researchers believe that:

A) smoking triggers the onset of symptoms in people who are already vulnerable to the development of a mental disorder, especially major depressive disorder.
B) smoking delays the onset of symptoms of psychological disorders in many people.
C) nicotine suppresses the release of glutamate, GABA, serotonin, and acetylcholine, and this neurotransmitter deficiency causes the symptoms of mental illness.
D) nicotine damages brain structures such as the amygdala, the thalamus, and the nucleus acumens, causing the symptoms of mental illness.