tobacco age limit History of minimum purchase by U.S. jurisdiction Legal age for tobacco purchases

"Children are the most vulnerable to second-hand smoke, which is six times more poisonous than mainstream smoke

Native American slaves were also sought after, but dwindling Native population at the end of the 17th century turned focus onto African slaves

Complications of Carbon Monoxide Poisoning Carbon monoxide poisoning can cause severe, long-lasting complications

Serum collection Blood samples were collected at three main time points for all groups: at baseline prior to e-cigarette exposure (week 0), after the 6-week exposure phase (week 6), and at the end of the 3-week treatment or cessation phase (week 9) 41