what does charcoal filter do in cigarettes Cigarettes: Every Brand Should Know Canadian Charcoal Full Cigarette –

So, that you can choose the coating of your choice

Brand Family: Astro Product Type: Cigarettes Country: Thailand City: Chiang Mai Collection Date: December, 2013 Price: 35.00 THB (1.09 USD) Stick count: 20 *Selecting any of the linked attributes above will open a new search, showing all packs that match this attribute.

Also, what about dual use

To achieve more effective filtration of cigarette smoke, specialized respirators with tighter fits, such as N95 masks or KN95 masks, may be recommended

You did that so when people saw them in your shirt pocket they would assume you hadn't opened the pack and therefore wouldn't try to bum one of of you