Smokers will quit if they see faces that are pained by their smoking.
この文章が以下のように翻訳されています。
(喫煙者が)煙草は痛い目を見て止めれる ー Smokers will quit if they see faces that are pained by their smoking.
(喫煙者が) ー Smokers
煙草は痛い目 ー faces that are pained by their smoking / eyes that suffer from their smoking
を見て ー if they see / when they see
止めれる ー will quit
参考になれば嬉しいです。