In addition, it has to be acknowledged the following limitation.
Owing to the tiny size of particles including nicotine and
3-ethynylpyridine originated from tobacco smoke,the particles are
able to spread to more distant rooms in non-smoking floor via air
ducts, hallways, window and utility ducts (Bohac et al., 2011;Køster
et al., 2012). Matt et al. (2013) further confirms the former assertion
by measuring tobacco smoke pollutants in 40 hotel rooms in
California. Their research finds that non-smoking guests staying
in non-smoking rooms of hotels without complete smoking bans
showed significantly higher levels of nicotine on their fingers than
after staying in hotels with complete smoking bans. Future research
should take note of this influence.