The rolled piece of card stock that people roll into their joints, is called a 'crutch'. I've smoked through a cigarette filtered joint. It does get you high, but it filters out THC and the resins start to come through the filter. It can be messy when you get down to the end. I do it at the beach for discretion, but the smell is not very stealthy. So you can smoke in sight of people, but hopefully you are downwind or far enough away, unless you want a new crowd of friends.