Go ahead and eat all the GMO corn, drink up the fluoride city water, and eat all the steroided beef, they are all made the same as todays MJ.
So are the grapes for your wine, the hops for your beer, the corn or potatoes for your vodka, the hormones in your chicken and pork, and probably 95% of every food item in your kitchen.
The only way to get away from it is to raise your own everything. Even then you have to be careful about the feed you give your animals, what is in the fertilizer you use in your garden, and what was used on the land before you got there.