Stopping smoking even in the last few weeks before you give birth can still have some benefits (NHS 2015)
Combined with the flexibility of the pleated mask material itself, this lets the mask conform to a wide range of face shapes, without creating the pressure points that nose bridges and stiffer materials can (and in my experience, do)
Provision of E-Cigarettes for Smoking Cessation in Pregnancy: Perceptions and Experiences of Pregnant Women from Two UK Sites Eleanor Lutman-White, Riya Patel, Lauren Bell, Deborah Lycett, Kelly Hayward, Ruth Sampson, Janani Arulrajah, Maxine Whelan International Journal of Environmental Research and Public Health 49
Second, both the Tobacco Control Act and the state legislation rely on a concept known as characterizing flavor