They may include: Cellulose acetate (common in standard cigarette filters) Paper or fiber layers to help shape airflow and catch larger particles Caps or screens to hold the carbon in place In these designs, different parts of the filter may do different things: Fibers may catch some larger particles
So, it is better to avoid them
The smell comes back, the filter wears out fast, and the fan often needs to run loudly
Smart & Efficient Performance
The focus of follow-up efforts to reduce smoking should be directed towards combustible tobacco smokers, while simultaneously exerting control over the increasing number of EC users and individuals who engage in dual use, particularly among young people
1992 Australian Psychologist 27 : 109113 Hoffmann D, Hoffmann I, El-Bayoumy K