Rubuta ci gaba don wannan sakin layi - Duk da haka, a cikin shekaru masu zuwa, an yi amfani da makamai masu guba a cikin yaƙe-yaƙe da yawa, galibi na mulkin mallaka, inda wani bangare ya fi dacewa da kayan aiki a kan ɗayan. Biritaniya ta 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 Tawayen Tambov
A cikin 1920, Spain ta yi amfani da makamai masu guba a Maroko 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.