I don't care what you put in your body. If you choose to drink gasoline and set yourself on fire, I'm fine with that.
As long as your behavior does not put others at risk or is detrimental to society.
Or, for that matter, behavior that we just do not like. So long as it does not infringe on your constitutional rights, society can ban anything it likes, just because it doesn't like it. Or make legal anything it likes, just because it does like it. Example there would be tobacco and alcohol. Society thinks they're swell, so they're legal (tobacco is kind of on the way out). Other drugs, society doesn't like.
You don't agree with what society likes and dislikes. Join the crowd. I don't agree with a lot of what society likes and dislikes either. Too bad, get over it.
How can you be for personal freedom and against it at the same time? Does the contradiction matter?