I fail to see any parallel between food and illegal drugs. I am unaware of any chemical addiction to food. Im also pretty sure people need to eat and Im not sure people need to take drugs. In this epic scenerio you produce here you are focusing on users/abusers, which is hogwash in association to many of the points brought by those who favor legalization. Those points are that our jails are full of dealers, drug induced crimes such as theft, there might be cases of drug induced rape as well. The other concern was with the crime that runs rampant due to drug trafficing, such as gang wars. This has been the focus of my concern. Im not aware of situations where food or over eating create such issues, once again it seems I must remind you that eating is an essential. Drug users, are primarily targeted to get to the source, which is the dealers. Those caught with small amounts for use are rarely locked up for any period of time and primarily get a slap on the wrist and are subject to a period of time in which government employees "give them the talk" as Einherjar and others had expressed as how to help those going overboard. Of course this rarely works, once an abuser always an abuser, it only takes one taste.
Myself I wouldnt care if junk food was cracked down on, or many of the additives used in food, it is under constant surveillence but much seems to be let go...... HOWEVER, many people have weight issues due to many reasons, some is simply to much intake of even good foods and some is simply metabolism. I believe as it stands now there is some effort by insurance companies, employers as well as in the field of healthcare to increase incentive to improve ones health through better eating habits.
I see no parallel and consider comparing the two problems to be day and night, which hopefully I have addressed to some level of understanding.