For 1 CANN = 1 Gram to even be feasible, the coin would basically have to be a PoS. There's no way that 1 CANN per gram is going to make it. That's valuing it over light/darkcoin as well. Is it worth it? Sure, in my opinion.
I personally think at least 100 CANN per gram is where it should be set.
This is how I'm thinking....
I have a $1,500 mining rig setup that costs $1.00/day to run x11 -/+. With current difficulties, I'm getting 100-150 CANN/day if I'm lucky. That would equal a little over a gram a day, essentially a profit of $16 -/+ according to Delta Nine's rating of $17/gram. That's a very steep profit when it comes to altcoins, or any digital currencies. If you were to price it at 1 coin = 1 gram, I would be getting 100-150 grams a day? That's a lot of cannabis and I highly doubt we'd get the market up that high, especially from the start AND have dispensaries agree to that ratio.