PT - JOURNAL ARTICLE ED - , TI - Tobacco use falling: WHO urges countries to invest in helping more people to quit tobacco DP - 2021 Dec 01 TA - Saudi Medical Journal PG - 1371--1373 VI - 42 IP - 12 4099 - http://smj.org.sa/content/42/12/1371.short 4100 - http://smj.org.sa/content/42/12/1371.full SO - Saudi Med J2021 Dec 01; 42