I never met my grandfather, he died from chronic respiratory illness when my father was 15, a respiratory illness he didn't have when he went to war.
What is interesting is that his war record doesn't mention being gassed, but prior to the Messines Ridge attack he and other sappers were sent into no mans land to prepare communication and jumping off trenches for the comming attack. It is likely therefore the cause of the damaged lungs was crawling through bomb craters and working in trenches filled with gas from an earlier attack.
When WWII came he didn't want any of his sons to join the Army, one was a chemist and unable to be released from important war work and the other two too young.
It must have been terrible for veterans of WWI seeing their sons going off to war barely 20 years after the war to end all wars.

