no smoking guide dogs

it’s fine for everyone else to smoke, except guide dogs. of all the dogs available to modern man i would have thought that a guide dog would be the least likely to smoke as it understands better than other dogs about medical related issues.
but i could be wrong. perhaps the pressure of the job gets to them. we know st bernards turn to drink, so perhaps guide dogs find relief through smoking.
https://www.funkypancake.com/blog/stuff3/2005/09/DSC04983-thumb.jpg