...like Leaford 
Mentholated Cigarette Smoking Inhibits Nicotine Metabolism
Although the effect on actual cigarettes is a negative one, on e-cigs it should/could just mean lower nicotine absorption.
Mentholated Cigarette Smoking Inhibits Nicotine Metabolism
Although the effect on actual cigarettes is a negative one, on e-cigs it should/could just mean lower nicotine absorption.