“吸毒成瘾”常见的英文表达是 “become addicted to drugs” 或 “be addicted to drugs” 。
“become addicted to...” 表示“变得对……上瘾；染上……瘾” ，强调从无到有形成上瘾状态的过程；“be addicted to...” 侧重于描述“处于对……上瘾的状态” 。
“drugs” 在这里泛指各类毒品。
例句：
He became addicted to drugs at a young age and his life has been in a mess ever since.（他年纪轻轻就吸毒成瘾，此后生活便一团糟。）
Once you're addicted to drugs, it's extremely difficult to quit.（一旦你吸毒成瘾，就极难戒掉。 ）