sentences:  According to a 2013 study published in the "Journal of Toxicology" that assessed quantities of pesticides marijuana smokers were exposed to, it was found that "recoveries of residues were as high as 69.5% depending on the device used and the component investigated, suggesting that the potential of pesticide and chemical residue exposures to cannabis users is substantial and may pose a significant toxicological threat in the absence of adequate regulatory frameworks".Marijuana also differs from other agricultural products in that it can not be rinsed with water as the product is traditionally dried or cured.The following six pesticides are considered highly toxic but commonly used on marijuana crops