It is a difficult dilema! I am from the UK and the issue is the same but there are slightly different considerations. Health care in the main is centralised and provided free of charge from taxation. It is considered acceptable to ban out right Narcotics (in the main) and heavily tax tobacco and alcohol. There has been talk of a sugar tax that is being pushed forward:
http://www.bbc.co.uk/news/health-38212608
This is already having a positive effect as companies reduce the amount of sugar in their products.
I agree with the right to choose as an individual, but it gets complicated when your right to choose impacts on the amount of tax I have to pay!