Ka cika wannan jumla: Duk da haka, a cikin shekaru da suka biyo baya, an yi amfani da makamai masu guba a yaƙe-yaƙe da yawa, musamman na mulkin mallaka, inda ɗaya bangaren ya fi ɗayan amfani da makamai. 'Yan Burtaniya sun yi amfani da iskar gas mai guba, mai yiwuwa adamsite, a kan sojojin juyin juya halin Rasha da suka fara a ranar 27 ga Agusta 1919 kuma sun yi tunanin yin amfani da makamai masu guba a kan' yan tawayen Iraqi a cikin shekarun 1920; Sojojin Bolshevik sun yi amfani da iskar gas don murkushe 'yan tawayen.
Tambov Rebellion a 1920, Spain ta yi amfani da makamai masu guba a Morocco a kan kabilun Rif a cikin shekarun 1920 kuma Italiya ta yi amfani da iskar gas a Libya a 1930 kuma a lokacin mamayewar Habasha a 1936. A shekara ta 1925, wani shugaban yaki na kasar Sin, Zhang Zuolin, ya yi kwangila da wani kamfanin Jamus don ya gina masa wata masana'antar iskar gas a Shenyang, wadda aka kammala a shekara ta 1927.