The consumption of mushrooms is self correcting. Primarily, tolerance of the active elements of mushrooms will keep you from being able to take them "every day for a year", I doubt there are enough mushrooms in the world for you to be able to take enough after several months to feel anything at all. Secondly, the spirit of the mushroom would rip you to shreds at some point as you are subject to self examination, does anyone who has felt the anguish of monsterous introspection of a serious dose of Lipa Ya actually believe that someone could escape the wrath of the fungus for a YEAR?
And finally, there is a distinct difference between addiction and habituation. the Addiciton to TV or late night snacks or anything that does not cause some sort of physical reaction to withdrawal is more than likely habituated rather than addicted. However, I am reminded of the questionare I had to fill out for Government Q clearance.
"Are you addicted to the habitual use of illegal substances such as..." and then they went on to list things that we couldn't get. So which is it? Were we addicted to the habit? (maybe)