[ohgeetee]

He can absolutely change this once he knows it is happening, just like sitting far back in his chair when he has a good hand, etc.

His vein is pulsing because he is excited about having a great hand. With lots of play and focus, he can calm himself and the vein won't pulse like its going to pop out of his head. Another option is for him to make the vein pump when he doesn't have a great hand, which is probably even easier. In the meantime, he could wear a beanie or cap and just hide it.

The whole idea behind a tell is that the person is completely unaware that it is happening, and until its called out, they wouldn't ever make an attempt to change it. The guy that peeks at his hole cards everytime 2 to a flush hits the board won't ever make the simple change of taking a little more time to memorize his cards until he reads about it or someone points it out to him. Taking advantage of it until then is taking advantage of a tell, just like the vein until the person makes the appropriate effort to change that.

While its certainly harder to stop the shakes or a pulsing vein than it is to stop asking your oreos if you should call, its definitely not impossible.