Traditional Zippo for lighting cigars?

I have heard in the past that the fluid which is put in the traditional Zippo has an effect on the taste of a cigar when it's used to light it. Is this the case? If so, why? I know it's butane and I don't understand what properties it has which cause it to make the stick taste funny as opposed to say Vector or Lava which are also butane and recommended for usage in lighters when smoking cigars.

I ask this because I've seen a lot of cigar smokers lately using a traditional Zippo and they swear it has no ill effect on the cigars flavor.