Correct me if I'm wrong, but I think the better nic buzz in dip, vs. smoking (or even vapin e-cig liquid), is because the nic is oxidated nicotine. I wonder if o-nic can be vaped without it being any more dangerous than using liquid nic in e-cigs.
Sorry for going off topic, just thought I'd mention this.
Well, I think it's due to the amount of nicotine. From my understanding (or at least what I've heard repeated hundreds of times by different people) is that one can of dip contains the equiavalent quantity of nicotine as 50 cigarettes.