Having a ciggy after a bong/pipe/spliff etc is pretty good actually. Sometimes I find the taste a bit rank, so I prefer a rollie after a spliff.
I remember hearing something about your blood vessels becoming wider when your stoned (thats why your blood pressure lowers), so if you have a ciggy after a spliff then the nicotine enters your bloodstream easier and quicker - resulting in a slightly better 'cigarette high' than usual. Try smoking a spliff with menthol baccy one day - its really refreshing, plus the menthol opens up yer airways easier so the THC gets absorbed easier aswell.
Or something like that. Im stoned.