While buyers of TVs can easily switch shops if they don't like a seller, drug users face an increased risk of arrest every time they search out a new dealer.
电视机的买方如果不喜欢卖方可以换一家，而毒品吸食者每次都是冒着被逮捕的危险才能找到卖家。
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But before you speed off to the nearest car dealer to switch to a brand new CNG vehicle, there are some drawbacks to the whole system.