Incidence of strokes has increased these last 20 years in young population. This rise could be linked to alcohol, tobacco or drug use like cannabis. Cannabis has previously been descripted as a potential factor of reversible vasoconstriction. The main objective is to show that an exhaustive assessment of a stroke facing a young person frequently lead to a diagnostic of reversible vasoconstriction due to cannabis use. Evaluation will focus on prevalence of strokes secondary to a reversible vasoconstriction attributable to cannabis in young subjects. There's a real public healthcare interest in terms of primary and secondary prevention to evaluate the role of cannabis as a risk factor of stroke in young population.
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Evaluation Cannabis use
Timeframe: 12 months
Reversible vasoconstriction on medical imaging of intracranial arteries at different moment
Timeframe: 12 months.