此外，之前的三任美国总统都已经承认或多或少吸食过非法的精神刺激药物，而据联合国统计，有七百万美国人都是常规的可卡因使用者。
The past three US presidents, furthermore, have all admitted to consuming – to one extent or another – illegal psychoactive substances, while seven million Americans, according to the United Nations, are regular cocaine users.