We did not use cotinine as a second confirmation means of abstinence because the binding of nicotine to antibodies might prolong the elimination of nicotine and its metabolite cotinine [17].
Adjustment of the daily dose is important because the metabolism of nicotine is accelerated during pregnancy, 20 21 22 and standard doses can result in under-dosing and consequently less efficacy.
Whether the sensory effects are due to nAChR or to TRPA1 or both cannot yet be answered, because the concentration of nicotine arriving at the tracheal nerve endings is not known.
Just because the ingestion of nicotine reduces parasite infection and does not have a subsequent effect of increasing lifespan of infected bees, this does not mean that there are no other fitness-related benefits or that at different doses effects may not be more pronounced.
Because of the predominance of nicotine in the vapor phase of SHS (> 90%) and because cigarette smoke is the only likely source of nicotine in the work environment (Hammond and Leaderer 1987), we used a passive monitor to obtain a quantitative measurement of vapor-phase nicotine in the breathing zone.
"Because there is plenty of nicotine available in the tobacco of commercial low-yield cigarettes, it is easy for the smoker to alter puff rate and/or smoking intensity," says the study, in the November issue of Cancer Epidemiology, Biomarkers and Prevention.
C57BL/6J females were clearly responding to the reinforcing properties of nicotine because they chose to drink over 70% of their fluids from the nicotine bottle.
Thus, the findings suggest that sleep loss may increase the likelihood of smoking during abstinence not through inhibitory or attentional mechanisms but because of the potential of nicotine to reduce subjective sleepiness.
"It could be that as your brain is maturing, you become less susceptible to the addictive effects of nicotine because the genetic component that is influencing the way nicotine interacts with these receptors may have less effect," says Chris Amos, a genetic epidemiologist at the University of Texas M. D. Anderson Cancer Center in Houston, who wasn't involved in the study.
