The point is that once there is no legislation to stop it, someone on minimum wage would be able to buy as much weed as he's able to use without making a noticeable dent on his incomes.
A lot of the world, including the country I live in, believes that products that are harmful to the society should be taxed to discourage their use. Harmful products typically include things like alcohol, tobacco, sugary drinks and candy. If marijuana would be legalized, it would certainly fall in that category. (It's important to note that a lot of the people supporting legalization don't think that marijuana is good, it's just that legalization would be immensely less bad than the present situation.)
As such, as I see it, the question of how much tax should marijuana have on it depends mostly on how much it can be taxed while still killing the business of the black market sellers.
A lot of the world, including the country I live in, believes that products that are harmful to the society should be taxed to discourage their use. Harmful products typically include things like alcohol, tobacco, sugary drinks and candy. If marijuana would be legalized, it would certainly fall in that category. (It's important to note that a lot of the people supporting legalization don't think that marijuana is good, it's just that legalization would be immensely less bad than the present situation.)
As such, as I see it, the question of how much tax should marijuana have on it depends mostly on how much it can be taxed while still killing the business of the black market sellers.