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New Zealand Health Survey [Internet]

One marijuana joint is often compared to smoking 20 tobacco cigarettes in terms of lung damage, according to the American Lung Association, due to similar effects on the respiratory system and exposure to harmful substances like carbon monoxide and tar found in both

1970's - 1980's

Environ Sci Process Impacts 16:23352354 Mathur RS, Mathur SP, Young RC (2000) Up-regulation of epidermal growth factor-receptors (EGF-R) by nicotine in cervical cancer cell lines: this effect may be mediated by EGF

Generally they end up getting burnt in the center or caked with tar and cannot withstand too much direct heat, so its helpful to buy plenty of these kinds of screens at once (since theyre cheaper that way anyway)