Possession
The penalties for possession of marijuana are set forth in 21 U.S.C. § 844:
A first conviction for possession of any amount of marijuana is punishable by up to 1 year in jail, as well as a minimum fine of $1,000.
A second conviction for possession of any amount of marijuana is punishable by up to a minimum time in jail of 15 days and a maximum period of 2 years, as well as a minimum fine of $2,500.
A third conviction for possession of any amount of marijuana is punishable by up to a minimum time in jail of 90 days and a maximum period of 3 years, as well as a minimum fine of $5,000.
Sale
The penalties for the of sale or possession with intent to sell marijuana are set forth in 21 U.S.C. § 841 (*Note: these are the penalties for the first conviction with no enhancing factors):
Sale or possession with intent to sell less than 50kg of a mixture containing marijuana is punishable by up to 5 years in jail, as well as a maximum fine of $250,000.
Sale or possession with intent to sell more than 50kg but less than 100kg of a mixture containing marijuana is punishable by up to 20 years in jail, as well as a maximum fine of $1,000,000.
Sale or possession with intent to sell more than 100kg of a mixture containing marijuana is punishable by up a minmum of 5 years in jail and a maximum of 40 years in jail, as well as a maximum fine of $2,000,000.