Doing drugs is not intelligent, and then when you catch a case---you feed the system, which again is not intelligent. Intelligent people avoid the Lion's Den (read Aesop's The Fox and the Lion)
If anybody is intelligent it's the people who make millions and billion off of people who do drugs. Now, that is what i call living a productive (albeit moral and ethically corrupt) life.
Intelligence is only avoidance if it is absolutely impossible to
not make a profit (in the relative ways you wish to judge it) by taking drugs.
But of course, that is not true. Many people have a great time - a better time than they could possibly have had without drugs (a fact which, potentially, having not had drugs - you may be somewhat reticent to accept)

- without quantitative effect on their life, at all (other than a good memory).
If anybody is intelligent, it's the people who understand that drugs are like getting into a car, they do something, which is positive, but they have a statistical potential of stuffing your life up (whether that be through random chance, their own foolishness or outside factors). They do not make generalisations either way because an intelligent person can see both sides of the argument.
I don't wish to spend all night arguing with you on this matter, you generalise, I do not. I don't give a flying fuck about what you've read - it's all tripe unless it councils shrugging the shoulders on the subject (due to the complexities of there being many pros / cons). Do what you will, limit your life, read books that support your theory - I care not
