“…Pertaining to tobacco use, the acute effect of smoking entails an increase in HR (Hasenfratz and Battig, 1992;James and Richardson, 1991;Pauli et al, 1993), though differences between habitual smokers and non-smokers in HR response to stress is unclear. Some studies reported no differences between smokers and non-smokers in resting HR (Kirschbaum et al, 1993;Perkins et al, 1992;Roy et al, 1994) or in response to psychosocial stress (Back et al, 2008;Childs and de Wit, 2009;Hughes and Higgins, 2010;Kirschbaum et al, 1993;Perkins et al, 1992;Tersman et al, 1991). Others reported increased resting HR in smokers (al'Absi et al, 2003;Phillips et al, 2009;Sheffield et al, 1997;Tsuda et al, 1996) and attenuated HR responses to psychological stressors in large community samples of men (Sheffield et al, 1997), in women (Girdler et al, 1997;Straneva et al, 2000) and with light as well as heavy smokers showing attenuated HR reactivity in comparison to non-smokers (Phillips et al, 2009;Roy et al, 1994).…”