e-cigarette

Under the same smoking conditions, the particle sizes of 10 brands of electronic cigarettes are distributed in the range of 10~70nm, and the particle number concentration per unit volume is between 1.08×107~6.27×107·cm-3. The aerosol particle sizes are smaller than those of traditional cigarettes.

Nicotine replacement therapy, NRT is a type of medicine that delivers nicotine to the brain through nasal and oral sprays and inhalers.

Department of Pulmonary and Critical Care Medicine, Peking University International Hospital, Beijing 102206, China