A lot of countries went own this path of decriminalization of Cannabis already and have no problems at all ...
In Thailand the problem is more the use of Yaba , Ice , Methamphetamines than Cannabis . By legalizing Cannabis , the ' authorities ' did a little step to reduce the amount of illegal chemical drugs taken . A good thing .
The medical benefits of Marihuana , ( prevention of cancer and reduction of stress levels that can lead to psychological disorder etc ) , especially when used in tea , food etc , far outweigh the dangers .
Anyway , who wants it , gets it , illegal or not .
The government got it right , It creates an aditional source of income for the people of Thailand . And for the country as well .