Hi there ~
Although there are no studies that show that recreational marijuana use has serious side effects, there are case reports of marijuana use on a recreational basis causing psychological effects and precipitating depression
. There is also evidence of other medical problems when the marijuana is "dirty" i.e. laced with other chemicals and substances. However that should be the least concern for you since you are using medical marijuana and in the recommended dosages only. I would encourage you to research more on the ill effects of marijuana on the national institute of health website.
I hope this helps. Take care and have a lovely day!