The UK’s Daily Finance examined the effects of the country approving prescription THC spray Sativex this week. They found the actual market value of marijuana could be anywhere from $1.50 to $10 per gram, as opposed to $20 in the US under prohibition. They based their numbers on various quasi-legal markets like Amsterdam ($1.50-$10 a gram) and Canada ($4.91). “In Canada, the standard daily dose of medical marijuana ranges between 0.5 and 1.5 grams, which would cost roughly $2.50 to $7.50 for most patients. By comparison, a basic daily dose of Sativex costs roughly $16 per day. And a daily dose of Marinol, a drug containing synthetic THC that’s prescribed for AIDS and cancer patients in the US, runs between $9 and $13.50 per day. This translates into a monthly price of $150 for marijuana, $337 for Marinol, and $480 for Sativex. Do the math. More news after the jump.