Acute health effects of heated tobacco products: comparative analysis with traditional cigarettes and electronic cigarettes in young adults

Background Heated tobacco products (HTPs) were designed to deliver nicotine by heating the tobacco instead of burning it. This study aimed to examine the acute health effects on the respiratory and cardiovascular systems during the use of HTPs and compare these effects with acute health effects evoked by cigarette smoking or electronic cigarettes (e-cigarettes). Methods The study group comprised 160 healthy young adults (age 23 years; quartile 1 (Q1) 21 years; quartile 3 (Q3) 26 years) with both sexes divided into groups according to their smoking status: 40 HTP users (H group), 40 traditional cigarette smokers (T group), 40 e-cigarette users (E group) and 40 non-smokers (C group). Heart rate, blood pressure, oxygen saturation, exhaled nitric oxide fraction (FENO), carbon monoxide concentration, temperature of exhaled air and spirometry were measured three times: initially, immediately after the exposure, and after 30 min. The exposure differed depending on smoking status: heating HTP, smoking a cigarette, using an e-cigarette and simulation of smoking. Results After 5 min of exposure, a significant decrease in FENO was observed in the H and E groups, from 12.8 +/- 5.5 ppb to 11.2 +/- 5.3 ppb in the H group and from 16.9 +/- 6.5 ppb to 14.2 +/- 6.8 ppb in the E group (p<0.01). A slight but statistically significant increase in the temperature of exhaled air after 30 min was observed in groups T and E, from 34.1 degrees C (Q1 33.6 degrees C; Q3 34.4 degrees C) to 34.4 degrees C (Q1 34.1 degrees C; Q3 34.6 degrees C) (p=0.02) in the T group and from 34.2 degrees C (Q1 33.9 degrees C; Q3 34.5 degrees C) to 34.4 degrees C (Q1 33.8 degrees C; Q3 34.6 degrees C) (p<0.01) in the E group. A significant increase in heart rate and blood pressure was observed in the T, E and H groups. Only cigarette smoking increased carbon monoxide levels (p<0.01). Conclusions The use of HTPs elicits acute respiratory and cardiovascular health effects.