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Tobacco products come in a variety of forms that are used in different ways. They In addition to leaf tobacco products, they are available as skin patches, chewing gum, nasal and oral sprays, inhalers, lozenges and tablets.  The nicotine may be delivered using , and electronic nicotine delivery systems (ENDS). These are some of the terms used to describe electronic nicotine delivery systems (ENDS):    

ENDS Vapes, vaporizers, vape pens, hookah pens, electronic cigarettes (e-cigarettes or e-cigs), e-cigars, and e-pipes. These products use an “e-liquid” that usually contains nicotine derived from tobacco, as well as flavorings, propylene glycol, vegetable glycerin, and other ingredients. The liquid is heated to create an aerosol that the user inhales.

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In some situation, sponsors may elect to only use the EX and, and if needed, the DA domainsdomain. EX would be used - when little relevant information is represented in EC , in a sense (i.e., when EC and EX are would essentially be duplicates of each other).  For example, the derivation for EX may just be the unmasking of the product, and a sponsor may decide not to show the EC because the derivations used for EX are obvious.  

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