Evidently, it is a very bad thing.
How can they legalize the drug that causes abnormal psychological reaction and leads to addiction?
It is worse than the alcohol, which is forbidden in both the Torah (the Old Testament) and the Quran.
Certainly, those who drink alcohol and don't mind .. may not object to this cannabis legalization.
http://quran-ayat.com/conflicts/english2.htm#The_Drinking_of_Wine_
quran-ayat.com/conflicts/english2.htm#The_Drinking_of_Wine_
Such forbidding includes alcohol and every drug causing drunkenness and addiction.