As a result of continuing research into the nature of viruses, we now know they consist of a nucleic acid (either RNA or DNA, but never both) surrounded by a protein coat called a capsid (see Figure 3.16)
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**Aesthetic Appeal:** The silver color of these tubes not only adds a visual appeal but also reflects the refined nature of the smoking experience they offer
References National Center for Health Statistics
Statistical analysis Cox proportional hazards models were used to examine the associations between cigar status and mortality outcomes based on underlying causes of death from the 10th revision of International Statistical Classification of Diseases and Related Health Problems (ICD-10) [21], reported as hazard ratios (HRs, with 95% confidence intervals, CI) with never smokers as the referent group
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