Smoking Marijuana has been linked to lung changes, just by smoking it you are simply harming your lungs. It has also been linked to memory loss, this is due to the fact that it disrupts a person's ability to process short-term memory. Smoking Marijuana has also been linked to causing addiction, although they say it is not bad for you, there has not been enough testing to prove so. Just like cigarettes were once promoted as a good thing due to no testing of the long-term effects, marijuana has the same problem as so far only minimal side effects have been shown. Due to marijuana being a fairly new thing to become legal, we can only wait to see the side effects, as people choose to put something in their body and have no clue what it might do to them in the future.