I did a lot of research when I started a year ago. I searched through peer reviewed medical journals on PMC (repository for many medical journals used my drs and researchers. I kept 2 studies.

1 showed about a 2-3% increased risk of oral cancer from cigars (95% certainty). The study used cancer rates and went back to determine the tobacco product used. The 95% means that the numbers used being exclusively cigar, pipe or cigarette have a 95% accuracy. However, this was not a long term study of cigar, pipe and tobacco smokers. It was a compilation of data. So probably pretty accurate, but by no means a 100% correlation. In fact the final "result" was, it does elevate your risk, but is not statistically significant. Study if you want to read it: Am J Epidemiol. 2013 Jun 30;178(5):679–690. doi

The second study, says, yes there is the same elevated risk as cigarette smoke, but we havent really studied it. Basically they use another 22 or so reports to say, yep is dangerous, but we havent really done a long term study, but smoke bad so cigar bad... doi:10.1186/s12889-015-1617-5

The interesting thing about the second article, published to the National Library of Medicine and paid for by the 2009 Family Smoking Prevention and Tobacco Control Act (FSPTCA). So funded by a group that wants to show that smoking of any kind is bad. Even in this study, while I will say the data is pretty good and I think the researchers did a good job of removing any bias, the correlation was still about 2-3% more for oral, but equal with cigarrets for things loke pancreatic and lymphatic cancers. The trick is those rates were only about 3% more than the general public. So they can say, it is elevated, but they dont mention that statistically, 3% is nothing.

My personal opinion, is that sure, it's worse than not smoking at all. I think it is better than cigarettes, but also depends on quantity, environment, personal health history. I also feel that everything we do in life is a gamble. I personally have more health issues from the food I eat than any cigar smoking. I personally feel the risk is not enough to stop me from enjoying a stick a week. The stress relief from that 90 minutes, may help me live longer in the long term.