Cribbing (wind sucking) releases endorphins in the brain, which of course makes a horse feel good. That is why it is all but impossible to stop. You can put a cribbing collar on  a  horse which is a big strap that goes around their neck right up by their head. It won't allow the horse to take in the needed air. I have seen horses that are bad cribbers, go up to fence post in a pasture and suck on it. It is a really bad deal, for the reasons Jersey Lilly posted.

Wood chewing, on the other hand can be a mineral deficiency. Supply the minerals they need and there is a good chance of stopping it. It is sometimes caused from boredom, but can have other causes. When cattle chew wood, it is a condition known as "Pica" and can be cured with

mineral.

As for the boredom part, Gene Ovenick,fairier and founder of EDSS (Equine Digital Support System) says horses are programmed to travel 6 miles a day.  When they are shut up and can't travel these other vices manifest themselves.

BTW, cribbing (wind sucking) is considered an UNSOUNDNESS.

If you have a good horse that started cribbing, I would do what I needed

to do to help him. If I had an opportunity to buy a good horse that cribbed, I would certainly walk away. You would just be buying a

big problem.

Hope this helps.