Tin foil = bad idea. Just because you have issues now doesn't mean you won't have issues down the road from smoking with tin foil. Supposedly it can lead to alzheimers (if you know anyone with this disease trust me you don't want to have anything to do with it) and probobly a bunch of other nasty lung related stuff. I would say learning to roll a joint, or just buying a piece are the two best options. You have friends that smoke though, maybe you can bumb a piece off of one of them. If you smoke them up as well they would be more than happy to let you use their piece as well

Of coarse a homemade gravity bong is always a good way to get baked.