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(WASHINGTON, Reuters)The risk of a heart attack jumps nearly fivefold during the first hour after smoking marijuana.
（路透社華盛頓電）開始抽大麻的一個小時之內，心臟病發作的危險性幾乎會激增五倍。
this poses a particular threat to middle-aged users of the drug, especially those over age 45.
這種危險性對于中年的大麻吸食者特別嚴重，尤其是超過四十五歲的人。
The increased risk from marijuana was more dangerous than sexual intercourse for a sedentary person.
對于久坐的人而言，抽大麻所增加的危險性比性行為還高。
Marijuana can cause the heart rate to double.
大麻會讓心跳速度增快一倍。
