The seltzer will give you a throat hit, very similar to inhaling nicotine. To many people, this is the most satisfying part of smoking (which nicotine gum/patches do not deliver).
The CBD will calm you, or at the very least act as a placebo to substitute the nicotine. You may feel your muscles relax or a calm wash over you, similar to shutting your eyes before you sleep.
You can bring them to work, drink them in the car, and literally pound them wherever you are without care.