Orleander
I think if your kid is an addict, the trust is already gone.
If it is then making it worse is still not a good answer.
Also being an "addict" is not necessarily the end of the world. While a some do die or never shake it, a large number of people flirt with addiction, get tired of it and move on. One study, which I wish I could put my finger on at the moment, found most (I believe it was around 75%) problems with addictive substances resolve in 2-5 years with or without treatement. One of the few exceptions was tobacco.
Either way, I value trust and an honest flow of education and communication far more than "drug" dogs.