You have to admit though, that smokeless tobacco is far less popular than cigarette smoking.
There is more data about the effects of cigarette smoking than there is about smokeless tobacco. So the cigarette data will be more accurate because of a better sample size.
Therefore, you can't say that (1) it is much safer than smoking, (2) that smoking causes more mouth cancer than smokeless, nor can you say (3) that it's healthier. You just don't have the same margin of error with the smokeless set of data that you do with cigarettes.
I thought this would be obvious. Guess not.