A new study has found that e-cigarettes labeled as “clear” may cause a greater increase in blood pressure and heart rate than other flavored e-cigarettes or no use at all. “Clear” e-cigarettes may look unflavored, but researchers discovered that they contain synthetic cooling agents, menthol, and other flavoring chemicals. To understand how “clear” e-cigarettes affect the body, researchers studied 207 people aged 18 to 45 in Boston between 2019 and 2023. The group included 23 people who used “clear” e-cigarettes, 111 who used other flavored e-cigarettes, and 73 nonusers. These agents might be helping companies get around laws meant to ban flavored products.