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How much tax would the government want from sales of recreational cannabis?
The going rate is currently £10 per gramme which, were you to account for the ordinary running costs of a legitimate business, doesn't leave much room for a product specific tax.
Considering the well-established illegal infrastructure, the public's attitude (it's normalised for a large part of it) and that recreational use is a low-priority for the police, then legal cannabis won't justify being considerably more expensive.
A good quality, efficient set-up for two plants using a commercial grade LED light will cost you around £700 and has the footprint of a wardrobe. Using feminised, automatically flowering seeds you will be cropping every three months and even a complete novice could produce 500g...
How much tax would the government want from sales of recreational cannabis? Currently 82% of the cost of a packet of fags is tax.