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The writer then clearly shows they are moving on to the other argument which is their own (and it has clearly been stated in the thesis that this is their argument): In this paragraph, 'they' is dropped because it is now the writers opinion

Gingival and Periodontal Diseases: Conditions such as necrotizing ulcerative gingivitis (NUG) is prevalent in smokers

But the complexity is also what makes behavior unique and interesting. Tobacco use kills more than 5 million people annually and is a risk factor for six of the eight leading causes of death, according to the World Health Organization

Etheridge Most people do not drink enough water, and one can dehydrate fast in the hot Alabama sun

New Zealand smokers perceptions of tobacco endgame measures: a qualitative analysis