However, while it has been proven to have some adverse health effects, it has also been found to be medically beneficial in many cases. Regardless, injecting a harmful or helpful drug into one's body is something no one should be able to decide for another person. Therefore, it should be left to the discretion of the user whether or not to put smoke into their lungs, and this personal freedom should not be violated. The common argument against this is that smoking weed endangers not only the user but others as well. Yes, there is violence related to marijuana, just like any other illegal substance. However, this is largely because it is an illegal substance and much of the violence is related to weed trafficking, not consumption. Therefore, this is actually another example of the pros of legalizing marijuana and the cons of keeping it on the black market.