Think you're being a bit hard on us smokers mate. Bad habit, and I am only too aware of the badness. But I smoke on the job, but have it down so that I know when I can do it without it interfereing with my work. And I'm careful to keep it out of the faces of those who don't smoke. Also, I surf and swim regularly, and have been climbing trees for about 8 years so I'm a LOT fitter than a lot of people I know who don't smoke. Certainly I don't cough my lungs up everytime I drag a branch up a hill or a bunch of branches big enough to make grown men cry for that matter In fact, I'm confident to say that I'm a credit to anyone I've ever worked for (except the first guy. He had me during the dropping branches on fences, putting unbreakable knots in ropes etc. stage. But even for him I came good in the end), and if I ever worked for you that you be glad to have me.
Agree with you about the booze though, hangovers and tree work are dodgy to say the least. On the very rare occasion I think it's acceptable though. We are all human let's not forget. Love nothing more than making the guy with the hangover miserable for the day:sneaky2:
Back on topic, When I started as I said above, the guy I worked for was at his wits end sometimes with me blunting chains, dropping branches in fences, generally like a one man wrecking crew but age experience and developing the motto "less haste, more speed" ethic I came good. In fact the reason I think he didn't sack me off the bat was that every time I came to him with a cut saw strop or broken rake I was literally p***ing sweat. Granted we had a good few lazy gits come and go during my time there. But there were definitely a few foreign lads who weren't up to scratch as well.
Think the reason there are proportionally fewer of them is that the ones who travel for work would want to be pretty sure they're going to hack it before they invest time and money in to moving, and some of them have family back home relying on them to earn money to justify the pain of them not being home.
For you employers on here, I think the fairest course of action is to keep giving the lads a start, but send em packing by lunch time if they ain't up to it. Can be a pain I'm sure as you wouldn't be taking on staff if you didn't need someone that day, but I'm sure you'll cope. And when you do find a goon un, you'll have a good un.