No one knows for sure. That's the truth. It's like anything else though too much of anything can't be good for you, right?
My opinion on it is, it's pretty fukkin safe. How does anyone explain that the heads of the families that make these cigars live into their 90s and 100s and smoke 10 cigars or more a day?
Also, the difference between a cigar and a cigarette is that cigarettes can contain over 300 different chemicals processed into them.
A premium cigar is 100% pure tobacco.