Meditation. If you prefer not to medicate, then you can just meditate. Meditation makes use of self hypnosis so you can calm your mind down. You can meditate on self hypnosis scripts designed to ease travel anxiety. Hypnosis scripts are available online, so you can invest in some subliminal CDs. You can even bring it with you on your trip.
Attend a hypnosis school. You can train yourself how to do hypnosis, but the self-learning is a lot faster if you have a little background about the practice. You can take a short course in a hypnosis school. With thousands of schools in the United States, and worldwide for that matter, finding one shouldn't be trouble.
You really do not need to follow the usual routine students do-that is, study in the evening. If you learn much better early audio subliminals in the morning or in the afternoon then so be it. Determine your productive hours.
I know that not everyone has as vivid an imagination as I do. So, maybe forming images in your head as to how you look, holding that cigarette may not work for you. Perhaps you are one of the many people that hypnosis and subliminal CDs or downloads just aren't enough. That's okay. There is nothing wrong with needing extra help. I have heard from people that have used nicotine replacement therapy, such as the patch or gum, along with hypnosis or subliminal CDs and downloads with great success.
No amount of conscious thought or physical action will change this - the thoughts are deeply rooted in your subconscious mind, and you will probably not even be fully aware of them.
The stress that comes with studying can be pretty high, making you sicker than before. You may also get easily tired or even emotionally imbalanced. One of the best ways to beat stress is to meditate. Meditation calms the nerves immediately.
Problem-solving dreams are reported invariably by most when the techniques are used for a few nights. Their decisions are found to be influenced from within. After a week or so, they recognize that their smoking has reduced to half and their speed of learning has had noticeable improvement. You have moved ahead in achieving your core goals.