if the smoker is opting for higher quality $ 300 per oz marijuana his annual pot bill would top $ 1000 that s for someone smoking the average of 3 53 oz per year a heavy smoker who goes with $ 300 per oz pot and uses say half an ounce monthly could expect to drop $ 1800 annually on his habitf the smoker is opting for higher quality $ 300 per oz marijuana his annual pot bill would top $ 1000 that s for someone smoking the average of 3 53 oz per year a heavy smoker who goes with $ 300 per oz pot and uses say half an ounce monthly could expect to drop $ 1800 annually on his habit