> If educating people worked there wouldn’t be any obese people, or drunkards

This assumes that a) everyone is the same, and b) education would always work. Matthew Perry explained that this is not the case. Some people respond differently to drugs. Whether these people are educated or not, changes very little. Education helps, but not in the way as to be able to bypass physiological aspects completely.

> Education is as useful as preaching abstinence at horny teenagers instead of providing access to contraceptives

Education can still help. For instance, I decided very early on that the best way to avoid e. g. addiction is to not "give in and try once". So I never tried drugs (ok ok, I did drink a beer occasionally). This was the much simpler and easier strategy to pursue, simply via avoidance behaviour.

Thus I disagree that the premise can be "if educating worked" - people will always respond differently to drugs. And they will have different strategies to cope with something too - some strategies work, others don't work. One can not generalize this.