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Chemicals such as tear gas, chlorine, phosgene and mustard gas were used by the Germans to defeat their enemies.
These war chemicals  created a new and complex public health threat that endangered  soldiers on the battle field and lots of civilians.
The Germans and Allied force used phosgene gas, which causes breathing difficulties and heart failure, also mustard gas that causes enemy's eye irritation and skin blistering. According to the CDC.

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By the end of the war in 1918 the allies had used more tonnes of gas than the Germans. In total, chemical weapons killed nearly 100,000 people during the conflict

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In the modern world today, there are still chemical weapons used. For example in Syria 2013, they used mustard gas, sarin gas, napalm and so on. These gases affected thousand of people; hundreds of people died.

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Science, L. (2018). World War I Unleashed Chemical Weapons and Changed Modern Warfare. [online] Live Science. Available at: https://www.livescience.com/58569-chemical-weapons-world-war-one.html [Accessed 4 Sep. 2018].

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The Germans failed to gain much advantage from their first gas attack because of the wind direction. It was not long before the Allies were developing methods that protected their troops from the gas.

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“Chemical Weapons in World War I.” Wikipedia, Wikimedia Foundation, 1 Sept. 2018, en.wikipedia.org/wiki/Chemical_weapons_in_World_War_I.

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"A Year After Khan Sheikhoun, Syria Chemical Weapons 'Still Used'". Aljazeera.Com, 2018, https://www.aljazeera.com/indepth/features/year-khan-sheikhoun-syria-chemical-weapons-180404120132586.html. Accessed 7 Sept 2018.

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Hughes, David. “Remembering the Day the First Poison Gas Attack Changed the Face of Warfare Forever.” The Independent, Independent Digital News and Media, 28 Apr. 2016, www.independent.co.uk/news/world/politics/chemical-weapons-warfare-remembrance-day-poison-mustard-gas-first-world-war-ypres-isis-a7005416.html.