My favorite two on hormones and IQ-

Effects of chronic marijuana use on testosterone, luteinizing hormone, follicle stimulating â?¦
University of Iowa Anesthesia Publications

Findings of a longitudinal study of effects on IQ
Current and former marijuana use: preliminary findings of a longitudinal study of effects on IQ in young adults -- Fried et al. 166 (7): 887 -- Canadian Medical Association Journal

Both short and sweet!- Granny:hippy: