I'm assuming you mean not inhaling all the way into your lungs. Swallowing smoke would imply pushing it into your stomach, that isn't one of the regular methods of ingesting nicotine. To begin with this is the idea behind Cigar smoking. read more
Generally, you don’t swallow smoke - you inhale it. Whether you get first hand smoke via inhaling or second hand smoke from just letting the cigarette burn near you or from having some nearby smoking a cigarette, the effects are plenty bad. read more