This is going to be tough so be prepared to do it. I used to chain smoke at my computer as well and spent all day on it. I am unemployed and spent the day editing cover letters or my resume. Other times I was on here looking at my motorcycle forum threads. I completely connected smoking (out back on my patio- no smoking in the house) with being on my computer. At the time I couldn't imagine thinking clearly, typing/drafting/editing on the computer without smoking. It is possible though but prepare yourself for the difficulty.
Is there any way to put your work on the computer on hold for a few days to a week until you can get over the initial hump of quitting?
Can you take your work to the public library inside or maybe a smoke-free cafe on your laptop and work there? (Don't bring cigs with you)
Your computer is a trigger to smoke so switch up the associations with your computer. Bring it where you can't smoke. What I did was I stuck with being on my computer, left the job hunting and concentration activities go for about 5 days, and distracted myself with the computer on other sites inside my house where I wouldn't smoke. I took it second by second, minute by minute, hour by hour until now I"m at the day by day stage. I'm smoke-free for 19 days today after a 25 year habit that started when I was 11.
Get your partner/roommate the buyin on your quit and get their support to stay the f' away from you while you quit. Threaten to rip their head off if they leave their cigs anywhere accessible or they offer or cave it to your requests for a cig. My fiance has been smoking this whole time (we live together too) while I quit and I laid down the rules with her from day 1 - no evidence of cigs anywhere including lighters, ashtrays, empty packs, etc. No smoking near me. No giving me a smoke when I ask or beg. Etc. You need their support. Take it minute by minute and I guarantee you can do it.
Let me know if I can help you more since I have been where you are.
