Since nicotine in cigarettes changes brain chemistry, perhaps thereby affecting mood, it is likely that smoking contributes to depression in teenagers.

由于香烟中的尼古丁会改变大脑的化学性质，从而可能影响情绪，因此吸烟可能会导致青少年抑郁。

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Your brain chemistry changes.

你的大脑化学物质在变化。

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I could feel my brain chemistry change.

我能感受到自己脑中的化学变化。

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The researcher said that before the body begins to freeze, cold can cause changes in brain chemistry which lead to hallucinations.

VOA: special.2010.02.24

Professor Stone says the emotional patterns could be linked to changes in how people see the world, or maybe even changes in brain chemistry.

VOA: special.2010.08.03

Meanwhile, Match.com now offers a "Chemistry.com" service, supposedly based on the science of brain chemistry.

FORBES: Getting Couples To Click

Our spending behavior is the result of our upbringing, our brain chemistry and our current life situation.

FORBES: Does Your Childhood Last Name Affect Your Adult Spending?

Rather, they suspect that addictive behaviour is the result of the same brain chemistry that helps prevent Parkinson's.

BBC: Smokers and drinkers 'protected against Parkinson's'