Prescriptions in Australia are generally for 5 or 6 quantities of 10gm, perhaps more, with a similar limit of 30 grams a month. In a low use situation, this means that a script could last 3-4 months or more. Thailand's 30 day prescription is going to force users to the doctor too often, more than necessary given that weed is going to be prescribed for chronic rather than acute cases. If medical weed goes the way it has in Australia, it will simply become a means for recreational users to obtain it on medical grounds.