In a scientific study published in EBioMedicine, carbon nanotubes were found in the lungs of children in Paris suffering from asthma (see http://www.ebiomedicine.com/article/S2352-3964%2815%2930175-4/abstract).

The study is the first to show that people are regularly exposed and the source of the carbon nanotubes is believed to be vehicle exhausts.

So far all the products in The Nanodatabase that are claimed to entail carbon nanotubes, use these nanoparticles embedded in a solid matrix or in paint and thus consumer inhalation is assumed to be limited from these kinds of uses (see http://nanodb.dk/en/search-database/#pageno=2&keyword=&fn.lp_m=2919&fn.d_cd_f=&fn.d_cd_t=).

For more, see https://chemicalwatch.com/43349/carbon-nanotubes-found-in-human-lungs and http://2020science.org/2015/10/23/are-you-breathing-carbon-nanotubes-and-should-you-be-worried/