The coarse carbon mats don't even filter half of the fumes.
These super basic fan+mat fume extractors do get the fumes out of your face, which is the most important part, but the particulate and VOC levels in the room will quickly exceed acceptable levels.
But even with a proper filter stack which filters over 99.9%, you can only filter what's actually captured. You still need some ventilation and it's also a good idea to run an air purifier in automatic mode to filter what wasn't captured at the source. What isn't filtered by filters is filtered by your lungs.
These super basic fan+mat fume extractors do get the fumes out of your face, which is the most important part, but the particulate and VOC levels in the room will quickly exceed acceptable levels.
But even with a proper filter stack which filters over 99.9%, you can only filter what's actually captured. You still need some ventilation and it's also a good idea to run an air purifier in automatic mode to filter what wasn't captured at the source. What isn't filtered by filters is filtered by your lungs.