I think there are lots of opinions on that but not a lot of concrete study evidence, Cap'n. Some of the opinions that are especially strong are regarding aluminum, but I know there are probably other equally strong opinions about other metals.

If you feel at all concerned, perhaps you should make a decision to go with Pyrex or ceramic.
birdgirl73 Reviewed by birdgirl73 on . NEED ANSWERS FAST PLEASE Is it true that when you smoke out of a metal bowl you are inhaling harmful chemicals due to the heat? I need scientific information on it, not just opinions. Your answers will help me decide if a "pocket bong" is a wise choice to own, anyone have any experience with one?:o Rating: 5