I've never used the No Pest strips myself, but after doing a Google search and finding the following article on the first page, in the 5th position, it would scare me away from ever using them.
http://www.nader.org/index.php?/archives/1293-Dont-Buy-No-Pest-Strip.html
A few quotes from the article:
"Don't buy No Pest Strips unless, that is, you be*lieve a product which vaporizes a nerve poison 24 hours a day in your bedroom, living room or family room is a necessary ingredient of modern living."
"The strips are almost entirely composed of a vaporizing chemical called DDVP. This pesticide was originally registered by the U.S. Department of Agriculture (USDA) in 1963 over the objections of USDA pharmacologist Dr. Thomas Von Sumter."
"Dr. LawÂ*rence R. Valcovic of the National Institute of Environmental Health Sciences, told the EPA:
"There is sufficient evidence from non-mammalian systems to indicate that DDVP has the intrinsic potential for inducing genetic alteration . . . I would recommend that human exposure be avoided if possible.""
Another quote from Wikipedia about DDVP..
"The
United States Environmental Protection Agency first considered a ban on DDVP in 1981. Since then it has been close to being banned on several occasions, but continues to be available. Major concerns are over acute and chronic toxicity. There is no conclusive evidence of
carcinogenicity to date, however a 2010 study found that each 10-fold increase in urinary concentration of organophosphate metabolites was associated with a 55% to 72% increase in the odds of
ADHD in children.
[1] DDVP is absorbed through all routes of exposure. since it is an
acetylcholinesterase inhibitor, its overdose symptoms are weakness, headache, tightness in chest, blurred vision, salivation, sweating, nausea, vomiting, diarrhea, and abdominal cramps."