The countries reported by GGTC to have e-cigarette sales bans include: Argentina Bahrain* Brazil Brunei Darussalam Cabo Verde Cambodia Chile* Colombia* Democratic Peoples Republic of Korea (North Korea) Egypt* Ethiopia Gambia India Iran (Islamic Republic of) Iraq Jordan Kazakhstan** Kuwait* Lao Peoples Democratic Republic Lebanon* Malaysia (some states) Maldives** Marshall Islands** Mauritius Mexico (despite some court rulings, a ban largely remains enforced) Nicaragua Norway (though some exceptions for NRT-like products might exist) Occupied Palestinian territory Oman Palau** Panama Papua New Guinea** Qatar Singapore Sri Lanka Suriname Syrian Arab Republic Thailand Timor-Leste Turkey Turkmenistan Uganda Uruguay Vanuatu Venezuela (Bolivarian Republic of) Vietnam** (* Indicates countries listed in a WHO background paper on D-ENDS bans

The Research Background Dr Harrow explained the background to the research: Few lung cancer patients who are current smokers at the time of diagnosis are able to give up prior to starting, or even during their treatment for various reasons
The tax on cigarettes is 8.9 cents per cigarette and other tobacco products are taxed at 65.03% of their wholesale price
To assess potential bias due to missingness, analyses: (a) compared participant characteristics by levels of missingness and (b) assessed whether tobacco or menthol JUUL was associated with missingness
Karin Grunebaum Cancer Research Foundation, and AHRQ Grant R18HS029430
If cigarettes are readily available and affordable, students are more likely to experiment with smoking