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What happens when people take drugs?
人們吸毒時發(fā)生什么？
There are three main classes of drugs, each of which has a different effect on the body.
主要有三大類的毒品，每一種對身體的影響不同。
Some drugs may make people feel happy, while others can make users feel tired or see things that are not really there.
一些毒品可能讓人們感到愉悅，而其他一些會讓吸食者感到疲勞，或者看見一些實際并不存在的東西。
Although these drugs can produce different reactions, they can all make people addicted.
盡管這些毒品會產(chǎn)生不同的反應(yīng)，但它們都會使人上癮。
One class of drugs is called uppers.
一類毒品被稱為興奮劑。
Uppers can increase the heart rate and make users feel very energetic and happy.
興奮劑可以加快心臟跳動速率，讓吸食者感到精力充沛，情緒昂奮。
The side effects of drugs in this class include difficulty sleeping, nervous tension, heart attacks and, in some cases, death.
這一類毒品的副作用包括難以入睡、精神緊張、心臟病，在一些個例中，還會死亡。
An example of an upper is a drug called speed, which is usually taken as a tablet or capsule.
一個興奮劑的例子就是一種被稱為“快速丸”的毒品，通常是以藥片或者膠囊的形式服用。
Speed is often used as a weight-loss pill, because it reduces one's appetite.
快速丸通常是用作減肥藥，因為它減少人們的食欲。
Some uppers are legal, such as nicotine, which is found in cigars and cigarettes, and caffeine, which is in coffee, tea and cocoa.
一些興奮劑是合法的，如尼古丁，可在雪茄或香煙中找到；還有在咖啡、茶和可可豆中都有咖啡因。
As smokers may tell you, people can become easily addicted to nicotine, which is why they have trouble quitting smoking.
正如吸煙者可能告訴你的那樣，尼古丁是非常容易上癮的，這就是為什么許多人很難戒煙的原因。
