You still can, with limited exceptions:
* Kids need to be vaccinated against ~9 ailments before they attend school (seems mandatory but homeschool is an option in every state)
* Adults need to be vaccinated against one before they patronize indoor restaurants, entertainment venues and gyms (completely optional activities and only in the densest city in the US, probably some others will follow)
There are also things you are banned from putting in your body, some by age (tobacco & alcohol) and some entirely (e.g. DEA scheduled drugs) and some controlled to the point that are effectively illegal to consume (e.g. meats that aren't allowed to be harvested or imported)