lol dude dont do that, even that nasty tar isnt gonna give you cancer.
The filter, especially if its been fucked with a good deal, is going to add fiberglass to the mix depending on what brand ciggs you're using. If you still wanna do this, find a brand of smokes that uses filters derived from cork or something (usually natural ciggs). Bongs are best, good bongs are far better. The more water the smoke goes thru the more I like it, check out Governmint bongs, they are retarded awesome and well made(American made 5m all the way thru incl the bell baby).