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A Guide to Smoking Etiquette When you enter the world of cigar smoking, you'll quickly discover it's rich with tradition, nuances, and etiquette

The first study found that vaping can worsen several heart disease risk factors at levels equal to tobacco cigarettes, while the second found that e-cigarettes decrease blood flow in the heart even more than tobacco cigarettes

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We have added to the text of the Stage 5 section "Our manuscript will include a discussion section that will highlight important and or surprising results from this review, discuss additional research questions identified, discuss the limitations of this review, and comment on the quality of the evidence identified." We have also added "and discussion" to the first sentence of the Stage 5 section of our manuscript to clarify that the PRISMA- ScR checklist will be used to inform the writing of our discussion section in addition to our results section