YOU SAID:

For one thing, I had not heard that they spouted smoke from their mouths.

INTO JAPANESE

一つには、彼らが口から煙を吐いたとは聞いていませんでした。

BACK INTO ENGLISH

For one thing, he had not heard that they had smoked through his mouth.

INTO JAPANESE

ひとつには、彼は彼らが彼の口から喫煙したことを聞いていなかった。

BACK INTO ENGLISH

For one thing, he had not heard that they smoked from his mouth.

INTO JAPANESE

ひとつには、彼は彼らが彼の口から吸うことを聞いていなかった。

BACK INTO ENGLISH

For one thing, he had not heard them suck through his mouth.

INTO JAPANESE

一つには、彼は彼らが彼の口から吸うのを聞いていなかった。

BACK INTO ENGLISH

For one thing, he had not heard them suck through his mouth.