The spliff replaces the cigar for the bitch, runt and thug models.

Just extract the pak4 to your Kingpin folder and it will be placed in the correct location (kingpin/main).

If you already have a pak4 file in your main folder then extract the new pak4 to a temporary folder somewhere and rename it to another number such as pak2, pak3 etc which you don't already have. Then copy it to your kingpin/main folder.