for people ages 21-70 (full criteria)
Healthy Volunteers
healthy people welcome
study started
completion around
Principal Investigator
by Neal Benowitz, MD (ucsf)
Headshot of Neal Benowitz
Neal Benowitz



This is a crossover study that will examine use behaviors, chemical exposures, and biological effects of Standardized Research Electronic Cigarette (SREC) compared to usual brand e-cigarette use in natural or synthetic nicotine users.

Official Title

Comparative Pharmacokinetics and Pharmacodynamics of Nicotine With Use of NIDA Standardized Research Electronic Cigarette (SREC) vs Usual Brand E-cigarette



  1. To characterize nicotine delivery, systemic exposure and effects from SREC in comparison with usual to usual nicotine brand use.

II. To assess aspects of harm of SREC use compared to usual nicotine brand use.


Eligible participants will be assigned to one of two treatment conditions for the initial assessment which will take place in a hospital setting. The participant will then be assigned to the second condition within 2 weeks after the initial assessment which will also take place in a hospital setting to repeat the same procedures.


Nicotine Dependence, Tobacco Toxicity, Cardiovascular Risk Factors, Nicotine Pharmacokinetics, Nicotine Pharmacodynamics, Electronic Cigarettes, E-Cigarettes, Tobacco Use Disorder, Standardized Research E-Cigarette (SREC), Over the Counter E-Cigarette (EC)


You can join if…

Open to people ages 21-70

  • Healthy on the basis of medical history and limited physical examination-
    • Heart rate < 105 beats per minute (BPM)*.
    • Systolic Blood Pressure < 160 and > 90*.
    • Diastolic Blood Pressure < 100 and > 50*.
    • *considered out of range if both machine and manual readings are above/below these thresholds.
    • Body Mass Index <= 38.0.
  • Current regular user of electronic cigarettes (EC)
    • EC device use at least 15 or more days in the past 30 days (with e- liquid >= 3mg/ml)
    • No restriction on flavor or type of e-cigarette used
    • Saliva cotinine >= 50 ng/ml and/or NicAlert = 6
  • Age >= 21 years old <= 70 years old
  • Willingness to abstain from drug use for the duration of the study

You CAN'T join if...

  • The following unstable medical conditions:
  • Medications
    • Use of medications that are inducers of nicotine metabolizing enzyme CYP2A6 (Example: rifampicin, carbamazepine, phenobarbital, and other anticonvulsant drugs).
    • Use of sympatholytic medications for cardiovascular conditions including hypertension (Example: beta and alpha-blockers).
    • Concurrent use of nicotine-containing medications (Example: nicotine patch, lozenge, gum).
    • Any stimulant medications (example: Adderall) generally given for attention deficit hyperactivity disorder (ADHD) treatment.
  • Other/Misc. Health Conditions
    • Oral thrush
    • Fainting (within the last 30 days)
    • Other "life threatening illnesses" as per principal investigator and/or study physician's discretion
  • Pregnancy
    • Pregnancy (self-reported and urine pregnancy test)
    • Breastfeeding (determined by self-report)
    • Women of childbearing potential must be using an acceptable method of contraception
  • Concurrent participation in another clinical trial.
  • Inability to read and write in English
  • Planning to quit smoking or vaping within the next 60 days
  • A known propylene glycol/vegetable glycerin allergy
  • Uncomfortable with getting blood drawn
  • Recent onset or change (worsening) in cough, fever and/or abdominal symptoms (vomiting or pain) in the past two weeks


  • University of California, San Francisco - Tobacco Research Center accepting new patients
    San Francisco California 94143 United States

Lead Scientist at University of California Health

  • Neal Benowitz, MD (ucsf)
    Neal Benowitz has been involved in patient care and conducting research at SFGH since 1973. His research focus is on the human pharmacology of nicotine in relation to pathogenesis of and individual differences in vulnerability to tobacco-related disease, and the use of pharmacologic data as a basis for public health policies to prevent and reduce such disease.


accepting new patients
Start Date
Completion Date
University of California, San Francisco
Study Type
Expecting 20 study participants
Last Updated