How bad would it be to take a few hits of a cigarette?

i have been a smoker for about four years now, and i would be proud to call myself a non-smoker soon. over the past week i have gone from smoking a half pack a day down to...four cigarettes on one bad day this week, and two on an average day. i have also been smoking either half, or a little less than half a cigarette at a time. i still have a pack and a half left, which i plan on giving to a friend who smokes the same kind and is tight on money when i hit the two week mark. i have printed out a chart that shows the benefits of quitting based on time all the way from 20 minutes to 15 years. i have made it to the 12 hour mark on the chart, and am at 19 hours of being cigarette free. the next mark is 24 hours. if i were to smoke less than half a cigarette, and i mean 5 hits at most, would i have to start over on my countdown? my worry is not that i will smoke the whole cigarette right away or go back to my half pack a day. my concern is that once i take those 5 hits i will have to start all over. based on your good judgement, can i cut myself the slack to take a few hits, or should i start all over if i give in?