<P> Dipping tobacco is packaged in "tins" or "cans", although they are not typically completely metal anymore . Dipping tobacco is also available in "rolls", "logs", or "sleeves", which is a package of 5 tins of tobacco, a similar concept to that of a carton of cigarettes . Ten tin rolls were also available in the past . Another package of dipping tobacco is the "tub", available in only select brands, equivalent to 6, 10, or 12 cans . </P> <P> Before opening the can / tin of tobacco, users typically "pack" the can, similar to how cigarette smokers pack a pack of cigarettes . This is done by placing one's thumb and middle finger on the sides of the can, and then quickly turning the can and flicking the wrist so that one's index finger taps the top of the can . </P> <P> Unlike snus, which is most often placed between the upper lip and gum, moist tobacco users or "dippers" tend to use the lower . Dipping in the upper lip is unusual, though when done, it is colloquially termed an "upper decker" or "top lip dip". The dip rests on the inside lining of the mouth for a period depending upon the user's preference--often 20--40 minutes . Nicotine and other alkaloids found in tobacco are absorbed in saliva sublabially by the inferior or superior labial arteries . Buccal and sublingual absorption may also occur . </P> <P> Also unlike snus, dip often causes the user to produce excess saliva during the act of dipping . This is typically spit onto the ground or in a container, because swallowing the saliva - tobacco mixture can cause irritation to the esophagus and induce nausea and vomiting . A spittoon can be used, but often users will simply use an empty plastic bottle or a "mudjug," a portable spittoon . Smokeless tobacco is sometimes used in the workplace by employees, especially if the employer does not provide many cigarette breaks or if the employee is consistently using both hands during work (which doesn't provide opportunities for cigarette smoking). Smokeless tobacco is popular in many industrial areas where there is a safety risk in having an open flame, such as oil rigs or refineries . </P>

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