sentences:  Paul Armentano, policy analyst for NORML, claimed because the rats were given THC at the young age of 28 days, it is impossible to extrapolate the results of this study to humans.In December 2006, a 12-year gateway drug hypothesis study on 214 boys from ages 10–12 by the American Psychiatric Association was published in the American Journal of Psychiatry.The study concluded adolescents who used cannabis prior to using other drugs, including alcohol and tobacco, were no more likely to develop a substance abuse disorder than subjects in the study who did not use cannabis prior to using other drugs.