Table 3.

Hazards ratios [95% Confidence limits] reflecting the association between factor scores representing positive and negative initial reactions to cannabis and tobacco and time to onset of nicotine dependence and cannabis abuse/dependence in European-American female twins.

	Nicotine Dependence	Cannabis Abuse/Dependence
Tobacco +	1.42 [1.29–1.56]	1.29 [1.10–1.51]
Tobacco −	1.21 [1.10–1.34]	1.23 [1.02–1.47]
Cannabis +	1.08 [1.00–1.17]	1.46 [1.28–1.67]
Cannabis −	1.09 [1.00–1.19]	1.22 [1.06–1.40]