I am on day 5.  Feeling just fine.  Been having some nightmares often involving my father, but then he was somewhat of a nightmare.
Last smoke was on morning of day 4.  I think a lot of the side effects you will have anyway.  I quit cold turkey years ago (which lasted 7 years up until my divorce), I got terrible colds and coldsores.  Fact is, your membranes have been fighting off cigarette smoke and therefore have thickened.  Your membranes are going to get thin and then back to normal.  Expect coughing, flu like symptoms etc.  The above was explained to me by my doctor - remember the above symptoms was with NO medication.