Juul continued to expand its market share gap with R.J. Reynolds Vapor Co.’s Vuse, now to a nearly 60 percentage-point advantage.

Wells Fargo Securities analyst Bonnie Herzog issued her latest report Tuesday, based primarily on Nielsen data.

Juul’s market share increased from 68 percent to 70.5 percent in the four-week period that ended July 14.

Meanwhile, Vuse’s market share dropped from 11.5 percent to 10.8 percent even as it lowered some product pricing to drive sales.

Juul, made by Juul Labs Inc. of San Francisco, entered the mainstream retail marketplace in 2015, and is sold in the form of a pen or a USB device. That design makes it easy to hide its usage.

A year ago, Juul was at 35.7 percent, Vuse at 26 percent, MarkTen XL of NuMark was third at 11.6 percent, blu eCigs of Fontem Ventures was fourth at 11.4 percent and Logic of Japan Tobacco was fifth at 7.5 percent.

By comparison, for the most recent period, MarkTen is at 7.7 percent, blu eCigs at 5.6 percent and Logic at 3.1 percent.

The Juul growth comes despite increased scrutiny from the Food and Drug Administration and criticism from anti-tobacco advocates about anecdotal reports on youths using the product, including while they’re in school.

On April 22, the FDA expanded and tightened its oversight over Juul products, including taking steps to halt online sales to youths on eBay. Although the four steps announced by FDA Commissioner Scott Gottlieb in a new youth tobacco-prevention plan apply to other e-cigs, the focus clearly was on Juul.

Two days later, Juul Labs agreed to take significant steps to address federal and state regulatory concerns, including “actively supporting” initiatives to raise the minimum age to at least 21 to purchase tobacco products.

In August, Juul began requiring purchasers of Juul on its website to be at least 21.

Juul also pledged an initial investment of $30 million over three years dedicated to independent research, youth and parent education, and community engagement efforts.

On July 17, Reynolds said it is preparing a nationwide launch in August of its version of a “pod mod” similar to the Juul vaping delivery mechanism.

The goal is to have Vuse Alto in national distribution by November. Sneak peeks of Vuse Alto show it being offered at retail in a mixed pack containing one flavoring pod each of original, rich tobacco, menthol and mixed berry.

On the traditional cigarette side, top-selling Marlboro’s volume fell 1.4 percent during the latest period, its leading market share inched up 0.1 percentage point to 47.2 percent

Meanwhile, No. 2 Newport of Reynolds dropped a 4.8 percent sales decrease. Its market share slipped 0.1 percentage point to 12.7 percent. Herzog said the brief decline continues to be caused by consumer disappointment with the launch of Newport Platinum.

Natural American Spirit jumped 6.1 percent in dollar sales. Its 3.4 percent market share rose 0.1 percentage point.

Camel and Pall Mall dollar sales were down 4.2 percent and 5.4 percent, respectively. Camel was unchanged at an 8.8 percent market share, and Pall Mall was unchanged at 6.6 percent.

ITG Brands’ Winston brand was down 5 percent, while Kool was down 0.8 percent.

ITG’s market share slipped 0.1 percentage point to 7.3 percent. Winston was down 0.1 percentage point to 2.2 percent, while Kool and Maverick remained at 1.6 percent.

rcraver@wsjournal.com 336-727-7376 @rcraverWSJ