Research has linked participation in sports to positive effects like better self-image, fewer teen pregnancies and higher grades.

VOA: special.2010.03.04

Many of the possible side effects are similar to those linked with the use of levodopa.

VOA: special.2009.04.07

Victims of Alzheimer's do die from its effects or conditions linked to it.

VOA: special.2009.09.15

The researchers suggest a "small but significant" negative effect of 4% linked to the combined effects of smoking and impaired lung function - itself linked to smoking.

BBC: NEWS | Health | Smoking 'is bad for your brain'

Phthalates have been shown to affect the development of the male reproductive system in lab animals, and a few small studies suggest they may be linked to subtle effects in the reproductive organs of infant boys.

NPR: New Safety Law Doesn't Mean All's Well In Toyland

Gregg Bloche, a Georgetown University medical ethicist, warned of the need to manage the downside of "race-based therapeutics"--and predicted that it was only a matter of time before race was linked to the effects of other drugs.

FORBES: Race-Based Medicine Arrives