Yes, you can light a cigar again, but it won't be the same experience.
According to information available, re-lighting a day-old cigar will not restore its original tastes and aromas. This is because some of the oils in the tobacco have already been burnt away. While you can cut and save a cigar for another day, be aware that the smoking experience will differ from smoking a fresh one directly from the humidor.
Therefore, while physically possible, the resulting smoke won't have the same quality as the initial lighting.
