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Opponents of legalising cannabis say the amount people could buy each day will make life worse for those who are already heavy users.
Those who support it say buying up to 14 grams of dried weed at a time is no different from stocking up on wine and wouldn't be used all at once.
It's one of the key areas of debate for those weighing up the Cannabis Legalisation and Control Bill ahead of next month's referendum.
Ben Strang reports.