The plant's ban, however, was not motivated by health issues, but by persecution of marginalized groups who used it socially. In the US, it was common for the drug to be used by Mexicans. With the Mexican Revolution, from 1910 on, the rejection of neighboring immigrants grew among the Americans, and marijuana became the target of films, books and reports that associated it with violence, murder and madness.
Source: cannabisesaude.com.br