The simple rule
Use 8mm cigarette filters for standard / regular / king-size cigarettes, and 6mm cigarette filters for slim cigarettes. The filter should fit snugly with no gap.
| Cigarette | Diameter | Filter size |
|---|---|---|
| Regular / king size | ~8 mm | 8 mm |
| Slim | ~6 mm | 6 mm |
| Super slim | ~5-6 mm | 6 mm + adapter |
| Hand-rolled (RYO) | varies | 8 mm (or adapter) |
Why fit matters
A filter that is too wide leaks air around the cigarette, weakening the draw and letting unfiltered smoke through. Too tight and it will not seat properly. Matching the diameter is the single most important step — more in our how to choose guide.
Adapters: one pack, both sizes
Many brands include small adapters so a single pack works with both 8mm and 6mm cigarettes. If you switch between regular and slim, choose a brand that ships adapters.
FAQ
What size cigarette filter is most common?
8mm is the most common size because it fits standard regular and king-size cigarettes.
Will a 6mm filter fit a regular cigarette?
No - a 6mm filter is for slim cigarettes. A regular cigarette needs an 8mm filter for a proper, leak-free fit.
Can one pack fit both sizes?
Yes, many brands include adapters so a single pack works with both 8mm regular and 6mm slim cigarettes.
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Shop Cigarette Filters on AmazonRead next: The complete cigarette filters guide