The high content of antioxidants in the alga Chlorella is a clear benefit to the health of smokers. Because smoking causes cell damage, Lee et al., (2009) found that, among smokers taking Chlorella, levels of the antioxidants vitamin C and vitamin E were up 44% and 16%. Therefore, the authors conclude that chlorella to an important antioxidant role.

According to a recent article by Panahi et al., (2013), supplementation with Chlorella vulgaris significantly improves antioxidant status and attenuates lipid peroxidation in chronic smokers. The authors conclude that chlorella may reduce the morbidity and mortality associated with smoking.