cannabis can trigger schizophrenia if it runs in your family, for me it sure as hell dumbed me but it changed my perception of things at the same time (in a good way though, kinda) i think that if i didnt do drugs i wouldnt realise how fake everything is....also if smoked regulary in large amounts when a teenager theres a 1 in 4 chance (might be 1 in 10) of you suffering psycosiss when your older..even if you stop smoking