Acute effects of electronic and tobacco cigarette smoking on complete blood count

► We evaluated acute active and passive e-cigarette and tobacco cigarette smoking. ► We assessed effects on complete blood count in 15 smokers and 15 never-smokers. ► Control and active/passive tobacco and electronic cigarette sessions were used. ► We observed no effects of e-cigarettes on complete blood count. ► Tobacco cigarettes increased white blood cell, lymphocyte, and granulocyte counts.