Pot Use Might Speed Onset of Psychosis: Study - MSN Health & Fitness - Addiction|Quit Smoking "People who smoked pot developed psychosis 2.7 years earlier than people with psychosis who did not smoke pot." I don't like the word "speculated". Thoughts GC? Has anyone had any personal experience/opinions that supports these findings? To the blades who have been smoking for years/decades have you noticed any difference in your behaviors?