Backing provides support for the author’s warrant. The backing should be from a reliable source and backed by credible authorities. (Clark 5). His backing is from a British researcher D.M. Warburton who showed that cigarettes do stimulate alertness, dexterity, and cognitive capacity. Brimelow also points out in his backing that smoking helps to keep a person awake while driving long distances or flying. Smoking can stimulate the central nervous system but it’s not wise to start smoking just to increase alertness. Smoking carries too many negatives for one small positive.