Answer :
Final answer:
Poisonous gases used in combat during WW1 had devastating effects on soldiers' health, causing severe injuries and psychological trauma.
Explanation:
An effect of poisonous gases used in combat during WW1 was the devastating impact on soldiers' health and wellbeing. Chemical agents such as chlorine, phosgene, and mustard gas caused severe injuries, including burns, respiratory problems, and blindness. Additionally, these gases caused fear and psychological trauma, as soldiers had to endure the constant threat of being exposed to these deadly substances.
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