Many of the cognitive enhancement drugs serve to increase focus and concentration. But 'letting your mind wander' is very often an important part of the creative process.
What's the greater risk? Letting go of what people think - or letting go of how I feel, what I believe, and who I am?
Age is an issue of mind over matter. If you don't mind, it doesn't matter.
Not all those who wander are lost.
J. R. R. Tolkien
Your mind is nirvana.