best hepa + activated carbon purifier for cigarette smoke. The Air Purifiers Smoke breathable air Best Air Purifiers for Smoke:

The efficiency rating is given in terms of 0.3 microns because particles of this size are the most difficult to filter

I shared these stats because I have never listened to the band

Heres a few to catch your attention

Public health authorities worry that people are being drawn to products that intentionally avoid the term e-cigarette. Of particular concern is use among teenagers, many of whom appear to view e-cigarettes and e-hookahs as entirely different products when, for all practical purposes, they are often indistinguishable

Researchers point out that e-cigarette users inhale nicotine in a vapor rather than smoke and claim that, because e-cigarettes do not burn tobacco, they do not expose users to the same levels of chemicals that can cause diseases in people who smoke conventional cigarettes. While the review gleaned insights into potential short-term safety effects, more data on long-term effects is needed, said Hartmann-Boyce

That means much bigger vapor clouds and much better battery life