Lots of people on SR have said that they craved sweet, sugary foods in early recovery, myself included. The concensus seems to be that it is to replace the sugar intake we had drinking alcohol.
As regards the coffee, cigarettes and sugar my opinion, not based on any kind of scientific data, is that a short term increase in these things is worthwhile if it results in your quitting alcohol
I should say I don't smoke so that did not come into my personal equation but as you are only smoking a few cigarettes a temporary increase seems acceptable.
Once you have some solid sober time behind you then maybe you could deal with the other things