多巴胺属于大脑化学物质家族的一员，它们传递神经元之间的信号。
Dopamine is one of a family of brain chemicals that transmit signals between neurons.
神经传递素是一种在神经细胞间传递信号的化学物质，在ADHD患者中，这种化学物质常常是指多巴胺，该物质的作用是调节愉悦和满足感。
A neurotransmitter is a chemical that carries messages between nerve cells and, in the case of ADHD, that chemical is often dopamine, which controls feelings of reward and pleasure.
研究者提出这可能与吸烟作用于大脑中的化学物质如多巴胺有关。
The researchers suggest it could be related to smoke's effects on chemicals in the brain such as dopamine.
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