The e-cigarettse are less strong than the e-pens. I like both, but as I'm a heavy smoker I sometimes need the e-pen. The wonderful thing is that my house does not stink any longer, and I do not have any cravings. The vype products are very well made and really work. I tried some other e-cigarettes before but always run into problems, but the Vype products work and charge as intended and are very easy to use.