I don't think people understand why the soda ca is actually dangerous. The danger from smoking out of a soda can mainly comes from the aluminum, you inhale microscopic particles that go into your bloodstream then they get stuck in some brain receptors, often leading to early onset of Alzheimer's disease. To get rid of the threat of plastic run your lighter over the bowl before you load it, because the only melted plastic that is exposed to heat will melt effectively instantly. For the paint, make sure the bowl just doesn't get so hot that the paint actually melts, oh and guess what paints are often made of things like rocks, plants, and sands which are all things that I don't mind smoking, or at least now are okay to smoke and expose to heat