I don't think it's the Visine messing up your high...I think it's just in your mind. One time my friend suggested Visine, since I had a family function an hour and a half later and I didn't want that crazy ass red eyes that I normally get. To make a long story short, 2 hours later, my eyes were white as hell, but I was still MESSED UP and did some pretty stupid things in front of them...I don't even like to think about it anymore!

Try putting the Visine in before you smoke...I don't know about the dryness, but your eyes stay white for your entire session...

Peace.