Australia already has some of the highest taxes on cigarettes. They have nationalized healthcare also, so a sugar tax can be seen more as reducing society healthcare costs, which are born by everyone more equally, rather than anything else. So the sugar tax can lower your taxes even if you don’t impuslively eat sugar, by lowering your burden in supporting nationalized healthcare (the goal behind the cigarette tax as well).

If this was America where much of the healthcare wasn’t socialized and it was every poor schlob for themselves, then you might have a point.