By Ian Sample for The Guardian. Not easily. Scientists estimate that the lethal dose of the drug is somewhere in the range of 15-70g. That is far beyond the daily consumption of even the most enthusiastic user.
Beyond the high that attracts about 180 million people a year worldwide, side effects range from anxiety and paranoia to problems with attention, memory and coordination. The acute mental impairment that comes from cannabis smoking explains why stoned drivers are twice as likely to crash their cars than unimpaired drivers.