5a47ee68_n_of_cannabis_for_personal_use_use_in_the_different_countries_Notes
[Country] Greece As with all drugs, cannabis-related offences of purchase, possession, as well as cultivation for exclusive personal use, are punishable by up to one year's imprisonment. Reduction/suspension or conversion of the penalty is foreseen in case of small quantity. [Legislation] Law 3459/2006 Art.29(1), (4) [Level of prosecution] Resin 2.5g, herbal 20g - Law 3727/2008 Art 15. Distinguished in law: cultivation of cannabis only may also be included as an offence of personal possession [Notes] 
There will be no entry in the criminal record if there is no same offence within 5 years (Art 29(2)).
EMCDDA | Overviews of legal topics: possession of cannabis for personal use
Notes