I think the most powerful is directly associated with the trigger mechanism of smell
Smoking prevalence, exposure to secondhand smoke, and factors associated with smoking among medical, dental, and pharmacy students in a public university in Malaysia Rashidi Mohamed, Isa Naina-Mohamed, Jaya Kumar, Nadzmi Teh Tobacco Induced Diseases 17
However, recent research shows that the production of NO is decreased after exposure to cigarette smoke (due to the toxic compounds and free radicals it contains), resulting in the decline of smooth muscle activity required for adequate erection
[DOI] [PubMed] [Google Scholar] Gagnet P., Kern K., Andrews K., Elgafy H., Ebraheim N
Floor Units: The MAX Guard line are the floor units in the LakeAir Product Family