FDA is interested in gathering scientific information from individuals with a broad range of backgrounds on the scientific topics to be discussed at the workshop. We are inviting presenters and panelists to address information pertaining to the questions listed below:
Toxicological considerations:
How can toxicological evaluations of the short and long-term effects of e-cigarettes in users be approached?
What are the potential roles of nonclinical models (e.g., in silico, in vitro, and in vivo) and human clinical studies?
What in vitro and in vivo models can be utilized for comparing toxicity between tobacco products?
What panel of biomarkers of exposure and toxicity in animal studies can be used to evaluate the toxicity of short and long-term e-cigarette use?
What panels of biomarkers of exposure and toxicity allow for cross-species comparisons (i.e., between animals and humans)? What are the limitations of scaling from animal to human studies?
What panel of biomarkers of exposure and toxicity could be useful for monitoring exposure and toxicity in humans across different tobacco products?
Where are aerosols delivered or deposited in humans?
What methods most effectively measure aerosol delivery/deposition/absorption?
What is the impact of local and systemic exposure (of e-liquid and aerosol)?
What aerosol constituents (e.g., chemicals, toxicants, flavorants, other additives) are delivered to users? Are there differences in delivery of aerosol constituents between new and experienced users?
What are the levels of aerosol constituents delivered to the experienced user?
How do levels of toxicant exposure compare to those in users of other tobacco or nicotine containing products (e.g., traditional cigarettes, other combusted tobacco products, smokeless tobacco, nicotine replacement therapy)?
What are the toxicological concerns associated with long-term inhalation of aerosols containing propylene glycol, glycerin and flavorings?
What is known about the toxicities of inhaled flavorings? Are some inhaled flavorings more toxic than others?
What strategies can be used to evaluate the potential toxicity of inhaled flavorings in humans?
What strategies can be used to demonstrate that an individual flavor ingredient additive does not increase the inherent toxicity of the e-liquid and aerosol?
Topography
How are e-cigarettes used in terms of actual use patterns (frequency of use) and topography (number of puffs per session, puff volume, puff duration, velocity)?
How can e-cigarette topography be evaluated to accurately capture user behaviors?
What factors impact e-cigarette topography? For example, how is topography affected by the type of device, reason(s) for use, or user subpopulation (e.g., polytobacco users, experienced users, youth)?
What strategies can be used to quantitate e-cigarette use? How can quantitative measures of e-cigarette use be compared to the use of other tobacco or nicotine containing products?
Clinical Pharmacology and Abuse Liability:
What are the pharmacokinetics and the pharmacodynamic effects of nicotine delivered via e-cigarettes?
How do the pharmacokinetic and pharmacodynamic properties of e-cigarettes differ in specific subpopulations (e.g., experienced users, naive users, dual users, youth)?
To what extent do e-cigarettes deliver nicotine via pulmonary absorption?
What are the primary subjective effects associated with e-cigarette use?
How do the subjective effects associated with e-cigarette use differ in specific subpopulations (e.g., experienced users, naive users, dual users, youth)?
What are the reinforcing effects of e-cigarettes? How do these compare to traditional cigarettes in smokers as well as to other combusted products, smokeless tobacco or nicotine replacement therapy?
What measures or methods can be used for assessing the reinforcing effects of e-cigarettes in users?
Are there ways that flavorings may enhance the abuse liability of e-cigarettes?
What non-nicotine constituents in e-cigarette aerosols may contribute to e-cigarette use and dependence?
What unique abuse liability risks may exist for e-cigarette users in specific subpopulations (e.g., former smokers, youth, polytobacco users)?
What is the impact of e-cigarette use on nicotine addiction (e.g., how may e-cigarette use increase, support or decrease nicotine addiction)?
What strategies can be used to evaluate the potential for an e-cigarette withdrawal syndrome? What strategies can be used to characterize e-cigarette withdrawal?
What are the characteristics of e-cigarettes that may affect uptake and use by nonusers, former smokers, and youth?
Health Effects in Users:
What are the known short and long-term health effects of e-cigarettes in experienced users? What are potential other short and long-term health effects of e-cigarettes in users that should be evaluated?
What are the potential short and long-term health effects of inhaling humectants (e.g., propylene glycol, glycerin), flavorings and other e-liquid additives?
What strategies can be used to evaluate the short and long-term health effects of e-cigarettes in users?
What biomarkers and clinical endpoints can be used to assess the impact of e-cigarettes on user health?
What evidence is available that e-cigarettes promote current smokers to completely switching as compared to continuing dual or polytobacco use? What data are available that indicate the characteristics of e-cigarettes that may enhance the potential for complete switching and how do these characteristics compare to approved cessation aids?
Considerations for Health Effects in Specific User Populations:
What populations of users may be at lower or higher risk of adverse effects related to e-cigarette use?
What factors could be considered in the evaluation of risk in vulnerable populations?
What are the health effects in dual users (i.e., users of e-cigarettes and traditional cigarettes or other combusted products)?
What unique issues could be considered in the evaluation of the short and long-term health effects in users of e-cigarettes in combination with traditional cigarettes, other combusted products, and smokeless tobacco?
What unique health effects may be of concern for users with underlying disease (e.g., chronic obstructive pulmonary disease, cardiovascular disease, diabetes mellitus, cancers, mental health disorders)?
What unique health effects may be of concern in youth e-cigarette users?
How can health risks associated with youth initiation and ongoing use be evaluated?
What are the short and long-term health effects of e-cigarette use during pregnancy? What is the impact of e-cigarette use during pregnancy on the pregnant woman and on the fetus?
How can the short and long-term effects of e-cigarette use during pregnancy be evaluated?
Human Factors:
What adverse events have been associated with e-cigarette use in users?
How are e-cigarette products modified by users and what are the inherent risks or consequences of the various modifications?
What strategies can be used to mitigate risks related to human factors?
What information do consumers need to adequately understand the product and mitigate risk?
What strategies could be considered to effectively communicate information about the product, especially user risks?
What labeling strategies could be considered?