As a smoker of both, I'll throw my two cents in.  I think "healthier" is a somewhat misleading term.  I think these things just kill you in different ways.  One thing is correct.  Cigarettes absolutely have added chemicals in them.  Assuming the cigars we're talking about aren't the machine made things (like Swisher Sweets), there shouldn't be anything other than tobacco.

The other big thing to mention is the two are smoked differently.  Cigarettes are inhaled to get the quick nicotine hit.  Cigars are not inhaled, and intended to be smoked for flavor.  I remember having a discussion with a guy a long time ago and being told there's no point to inhaling a cigar because your lungs can't taste.

That said, when smoking a cigar there's always going to be some smoke breathed into the lungs because there's a cloud of it floating around your head.  Ultimately both of these expose the mouth and lungs to smoke.  I would say that a cigar or two in a week would be less taxing on the lungs than a pack of cigarettes a day.

@Joe - I think hes more at a cigar or two a day. But hes breathing is much better now. I imagine smoking a pack a day where its inhaled into the lungs must be worse than inhaling into the mouth at least from a respiratory point of view.

@RM- Yeah he probably is kidding himself a bit. But hes a salty sailor type and hes not going to change for anything lol. This man loves his cigars.

   When my younger sister smoked she was the same way.  She'd smoke at the bar then not think about it for a few days.  I on the other hand was totally addicted.  I smoked two packs a day and if I partied, which I did often back then, it was up to four.  As I mentioned above I quit about 35 years ago.  If I smoked just one right now I'm sure I'd be full on addicted again.  In many of my dreams I still smoke.  It's a tough habit to break.

Yes, and there are so many actions one associates with smoking.  Smoking while drinking alcohol or coffee, smoking after making whoopie, smoking after a good meal, smoking during a work break, smoking while doing a #2, etc., etc., etc...  I quit countless times before it actually took for good.  My mom and I quit on the same day; November 19, 1988.  Sadly she didn't quit soon enough and eventually died of lung cancer. 
     This is a little off topic but it's something that amazes me.  One of the reasons I quit was the cost.  This was back in 1988 mind you when they cost much less than they do today.  Every poor person I know smokes.  They live in crap, don't have enough money for decent food, to pay their bills, or for gas in the car but they always have cigarettes.  They often can't afford a full pack so they sell each other "loosies" which are single cigarettes.  Nicotine/tobacco addiction is as strong as any narcotic addiction. 

   Again this is a little off topic.  When I was in the 101st some of the guys in my platoon got sent down to Panama for Jungle Training.  I've never had a real Cuban cigar but when the guys got back they had Panamanian cigars.  I remember one of the brands was Wolf Brothers.  These were the best cigars I ever had.  They were rich, sweet, strong, and flavorful.  Cuban cigars are supposed to be better but that's hard to  imagine.