If I were to pick a place to tax, the addictive, harmful substances seem like a good option. But that’s easy for me to say because I don’t smoke. I do like sugar though. Imagine the impact on our health if there were a sugar tax.

There is in some places. California has a hefty sugary-beverage tax, for example. I'm intuitively "for" things like this, but I'm curious if it's been long enough that we've been able to collect data showing any effects.