I don't know why anyone would want to stuff a cigarette filter into the end of a reeferette. Usually a "filter" or "roach" for a reeferette is a piece of thick paper or business-card stock used as a holder so that the reefer can be mostly cosumed without burning the tokers fingers, it has no filtering effects actually. The unburnt dope in a reefer does the filtering for you, thats why pipes are more efficient. (This is where the light goes on for you I hope)