Chemistry Central Journal 2009, 3:13 (6 October 2009).
Antioxidant activity of noni juice in heavy smokers.
Wang MY, Lutfiyya MN, Weidenbacher-Hoper V, Anderson G, Su CX, West BJ.

Noni juice demonstrated significant antioxidant activity in current heavy smokers in a one-month, double-blind, placebo-controlled clinical trial. (available online at http://journal.chemistrycentral.com/content/3/1/13).