The question is whether marijuana is good or bad? The answer for this question depends on you whether you use it as a medicine or as a drug for intoxication. That's why the state government of many US states have introduced some rules and regulations for its use. You have to follow those rules and regulations in order to buy medical marijuana in Los Angeles or if you want to take MMJ treatment. Some of the rules may vary from state to state, but one rule remains the same, which is its use is allowed only to individuals who really need it.
There are specialized shops from where you can buy cannabis and you need to know that many of those can be fake. So, you have to do some research before selecting a particular shop for buying cannabis. Try to find out whether the shop or the retailer holds a valid license to sell cannabis and if it has, then do some more research like reviews of people, which will also prove quite helpful.