Congrats on trying to quit smoking. It is a huge step towards improving your health and ability to hike around the mountains. Smoking is a risk factor for nearly all medical problems. I would recommend you make a visit to your primary care practitioner. He or she can prescribe some medication that will significantly improve your success. There are two major options. The first option is nicotine replacement therapy which consists of lozenges, gum, or a patch. The other option is a pill you take to reduce cravings, either Chantix or Zyban. Chantix has been shown to be more effective than Zyban. In addition to medications, your doctor can also set you up with a tobacco cessation program. I know a lot of guys have already recommended this stuff, but just wanted to give you an overview of treatment options from a medical standpoint.