noun
antismoking activist
Refers to a person who actively campaigns against smoking, often in public spaces.
彼は嫌煙活動家として、公共の場での喫煙禁止を訴えている。
As an antismoking activist, he advocates for a ban on smoking in public places.
Compound of 嫌煙 (けんえん, 'antismoking') + 活動家 (かつどうか, 'activist').