Fully-standardised, pharmaceutical-quality cannabis flos is the whole, dried flowers/inflorescence of the cannabis plant, which is genetically and chemically standardised according to pharmaceutical standards. It is free of contaminants such as microbial contaminants (molds, fungi, and bacteria) pesticides (residues), aflatoxins, impurities and heavy metals.
 Douglas, H., Hall, W., Gartner, C. (2015). E-cigarettes and the law in Australia. Australian Family Physician. 44 (6): 415-418.
Jensen, P., Luo, W., Pankow, J., Strongin, R., Peyton, D. Hidden formaldehyde in e-cigarette aerosols. New England Journal of Medicine. 372 (4): 392-393.
Editorial and Review (2019). E-Cigarettes and vaping-related disease. New England Journal of Medicine.
 A variety of diluents, which act as carrier agents, have been used in vape pens, including Polypropylene Glycol (PPG), Propylene Glycol (PG), Polyethylene Glycol (PEG), Vegetable Glycerin (VG), and Ethylene Glycol (EG).
Given the associated health risks with the consumption of the above-noted diluents, vaporizer cartridge producers seem to be moving towards using terpenes, or alternative extraction methods which produce a less viscous cannabis concentrate, eliminating the need for diluents altogether.
 Troutt, W., and DiDonato, M. (2017). Carbonyl compounds produced by vaporizing cannabis oil thinning agents. J Altern Complement Med. 2017 Nov;23(11):879-884.
 Eisenberg, E., Ogintz, M., Almog, S. (2014). The pharmacokinetics, efficacy, safety, and ease of use of a novel portable metered-dose cannabis inhaler in patients with chronic neuropathic pain: A Phase 1a study. Journal of Pain & Palliative Care Pharmacotherapy. 28:216–225.
Hazekamp, A., Ruhaak, R., Zuurman, L., van Gerven, J., Verpoorte, R. (2006). Evaluation of a vaporizing device (Volcano) for the pulmonary administration of tetrahydrocannabinol. Journal of Pharmaceutical Sciences. 95(6):1308-17.
 A vape pen (an atomiser vaporiser) is a device typically containing an electronic heating system and a cartridge (containing a cannabis-based liquid (i.e. decarboxylated cannabinoids and excipients (a diluent or carrier agent)). The liquid is heated, creating an aerosol vapour which is inhaled via a mouthpiece.
 CDC update (25 February 2020). ‘Outbreak of Lung Injury Associated with the Use of E-Cigarette, or Vaping, Products’
 Blount, B., Karwowski, M., Shields, P., et al. (2020). Vitamin E acetate in bronchoalveolar-lavage fluid associated with EVALI. N Engl J Med 2020; 382:697-705.
 Eisenberg, Z., Moy, D., Lam, V., Cheng, C., Richard, J., Burack, B. (26 October 2019). Contaminant analysis of illicit vs regulated market extracts. Anresco Laboratories.
 Queally, J. (2019). Counterfeit cannabis products stoke black market for California weed. Los Angeles Times; 26 August, 2019.
 Eisenberg, Z., Moy, D., Lam, V., Cheng, C., Richard, J., Burack, B. (26 October 2019). Contaminant Analysis Of Illicit Vs Regulated Market Extracts; Anresco Laboratories.
 Dryburgh, L., Bolan, N., Grof, C., Galettis, P., Schneider, J., Lucas, C., Martin, J. (2018). Cannabis contaminants: sources, distribution, human toxicity and pharmacologic effects. Br J Clin Pharmacol. 2018 Nov; 84(11): 2468–2476.
 Health Canada (2019). The Canadian Cannabis Survey 2019