Wow, so many interesting comments and stories!
Sharon - I'm so excited for your progress! 10K by 10-10! I love it. I'm running my first 10K on 10/11 so we can share stories that Monday! You can absolutely do it. Train your heart out (making sure to avoid injuries and listening to your body!) and you'll feel a great sense of accomplishment regardless of how you finish (run, walk, crawl...haha).
Jayjay - Good luck on your 5k
Cake - Awesome new pace! Running fast intervals is great and all, but speeding up your comfortable pace is so exciting and such a great marker of your growing endurance and fitness. Congrats!
Windchime and all other winter runners - I commend you all on your ability to run in such awful weather! I'm completely spoiled and refuse to run outside unless it's about 68 degrees and slightly cloudly (haha, not quite, but pretty much...). Honestly, the treadmill CAN be your friend, but make sure to put it on 1% incline to prevent injury and to better simulate outdoor running. It's also fun to play around with speeds to change things up. Also, a cool new exercise I've found is walking incline lunges, both straight ahead and sideways...does wonders for the thighs and quads!
Mk - 8 days!! 8 days!!

Having learned about the science behind smoking and quitting and all that, I know (though can't fully understand) how physically and mentally difficult this is for you. You're right, you're basically going through a chemical depression. Taking St. Johns Wart is a great idea, as is sticking to running, even though it may seem kind of miserable, but it'll get those endorphins going and eventually make you feel better. You're SO beyond ready for your marathon, so is there any way that you can shorten your runs just a bit so you don't dread them? Think back to your favorite runs...how long were they, where were they run, how did you feel? Maybe try to recreate one of those runs so you can get back to truly enjoying the running. I know a huge part of the marathon is the challenge and proving to yourself that you can do it, but I hope you try to enjoy the process too! You're right, only 3 more weeks, it'll fly by! But maybe try to really enjoy the next 3 weeks of your training and think of running as your gift, your joy, your release, your strength, and all of the other amazing things it's done for you up to this point. This may be WAY too sappy for someone going through nicotine withdrawl and feel free to virtually punch me (I won't be offended!), but just remember why you're doing all of this. And remember that you continue to inspire all of us every day! Thank you for your continued advice and support! I know I wouldn't be doing this well without you!
Quick 4 miles for me today. I could barely get my butt out of bed and so didn't wanna run, but of course, felt so much better after I did. Shocking, I know. Have a great day everyone!