Cardiovascular Effects of Very Low Nicotine Content Cigarettes

The study is measuring Cardiovascular effects of very low nicotine content cigarettes on daily and non-daily smokers

Inclusion Criteria: * Self-reported cigarette smoking at least once in the past 30 days * ≥21 years old * Willingness to smoke research cigarettes or usual brand cigarettes during lab visit. * Ability to speak, comprehend, and read English sufficiently to complete study procedures Exclusion Criteria: * Self-reported diagnosis of cardiovascular diseases like coronary artery disease, stroke, peripheral artery disease, cardiac arrhythmia, pulmonary embolism \& blood clots in legs and arm in the past 3 months * Body temperature ≥ 100.4˙F * Unstable health conditions interfering with electrocardiogram (ECG) measurements * Self-reported diagnosis of hyperthyroidism or thyrotoxicosis * Currently pregnant (as indicated by urine pregnancy test at the start of laboratory visit) or breastfeeding. * Currently seeking treatment to quit smoking