First off yes there are pesticides in cotton. Those are three of many links available.
http://www.ota.com/organic/environment/cotton_environment.html
WWF - Cotton Farming
Cotton | Pesticide Action Network
And yes organic cotton uses pesticide just not synthetic pesticide and generally uses less than conventional cotton.
Organic cotton - Wikipedia, the free encyclopedia
And lastly.
[url=http://www.plosone.org/article/info:doi/10.1371/journal.pone.0057987]PLOS ONE: Metal and Silicate Particles Including Nanoparticles Are Present in Electronic Cigarette Cartomizer Fluid and Aerosol[/url]
[url=http://nano.foe.org.au/node/350]Nanoparticle exposure related to serious lung damage, deaths of Chinese workers | Nanotechnology Project - Friends of the Earth[/url]
[URL="http://www.missouristate.edu/assets/Sustainability/MSU_DRAFT_Nano_Best_Practices_for_Labs_2013.pdf"]http://www.missouristate.edu/assets/Sustainability/MSU_DRAFT_Nano_Best_Practices_for_Labs_2013.pdf[/URL]
The information that I am trying to impart is that we do not know to what degree we are inhaling the nano particles of these things. And nano particles are what hurts us long term. It is the nano particles in crystalline silica that causes silicosis.
DO we still inhale these when the wick is wet? It would seem unlikely but the research has not been done!