Yup. I've solved many a perplexing problem over a five minute cigarette break. Now that I've quit, I find a brisk five minute walk is a suitable substitute, but not quite up to par with the nicotine. I consider it a good compromise though, considering the health risks.

FWIW, if you find nicotine (or caffeine as suggested in nearby comments) helps you cognitively, that's a potential sign that you have a dopamine deficiency (i.e. ADHD).

Well, I have been diagnosed with ADD, so that would make sense.

What's your caffeine intake like? I'm wondering if drinking an extra cup of coffee can help cognitively or if the caffeine stimulation just makes the nicotine craving worse.

I don't think there is a general answer. I have to quit coffee when I try to quit smoking (it reduces the craving and helps me to sleep at night), but I know people who have quit substituting the tobacco with huge amounts of coffee. You will have to find what works better for you. Good luck!

Very high. I only stop when I start getting the jitters. although, back when I smoked, I was never one that had to have a cigarette and coffee together, but I hear it's very common.