First, they are drugs (chemicals), might have side effects and are somewhat addictive.

第一，它们是化学药物，会带来副作用，用习惯了可能上瘾；

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There is no cure and existing drugs, which raise levels of key brain chemicals, do not work for everyone and their effects wear off over time.

没有药物能治愈它，也没有药物对此有长期疗效。 那些提升大脑关键化学成分的药物不是对每个人都适用，而且它们的药效也会随着时间流逝而减弱。

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Drugs, plastics and many other industrial chemicals consist of large carbon-based molecules.

药物、塑料和其他许多工业化学品具有大型的含碳分子。

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The use of chemicals and drugs in farming is viewed with much suspicion almost as much, in some quarters, as the evolving experiments in genetic modification.

ECONOMIST: They’re burning animals again | The

In a market filled with companies that acquire knowledge and then use it to produce chemicals and drugs with immediate importance, Celera is charging an arm and a leg for a library with really nifty computers.

FORBES: Celera's worth still up in the air

Bayer has finally recognized that there is little to be gained from tightly binding its chemicals, agriculture and drugs businesses together.

FORBES: Bayer Finds Breaking Up Hard To Do