Corrected entry: Before firing the nuke in the mother-ship Will and Jeff light their cigars, but when they are walking in the desert after returning to earth the cigars look like they only just have been lit, even though over 20 min have past. The control-center hasn't heard for them in 20 min and there wives and the president have to drive all the way out to them to greet them before we see the cigars again.
Fidosan
4th Feb 2010
Correction: Cigars don't have the chemicals that cigarettes have in them to keep them constantly alight. Invariably a cigar will go out and will need to be relit, so its perfectly reasonable that they are the same cigars.
GalahadFairlight