How does Zyn affect the brain?

Could you elaborate on the neurological impact of Zyn? I'm particularly interested in understanding how it interacts with the brain's chemical messengers and neural pathways. Are there any known changes in neurotransmitter levels? Do users experience altered cognitive function, mood, or sensory perception? Have any studies been conducted to assess the long-term effects of Zyn on brain health? And are there any warning signs or symptoms that should prompt users to seek medical attention? Understanding these nuances would help inform my decision regarding Zyn's safety and efficacy.