Punished for mimicking

When I was a teenager, I heard a quote that seemed so true, I have never forgotten it:

"Children are punished more often for mimicking their parents than for disobeying them."

Case in point: When my son was two years old, he was eating some potato chips.  I asked him if I could have one.  No.  Please?  No.  Pretty please?  No.  Just one little chip?  No.  What if I just grab one?  He moved the bag out of my reach, like I do with things I don't want him to have.  I pretended to cry. Please?  No.  He covered the chip bag with a dish towel so I couldn't see it, another technique of mine.  It became a game for me to try to persuade him.  He stoically ignored my requests and kept slowly eating chips.  I laughed and gave up, impressed with his determination.  I realized that through my example, I had taught him to say 'no' and mean it.   I hope when he is 14 years old and someone tries to presure him to take drugs, he has the same confident determination to say no!