[trux]

Definitely avoid that. It is a very irresponsible behavior! When driving you should be doing nothing else than driving, and be fully concentrated only on that. Blackout is the extreme case, but already a light loss of motoric control (samba) may lead to a fatal accident. And even reducing the oxygenation of your brain and organism even only slightly (far before samba), means reducing its capacity to evaluate the situation and react correctly and quickly.

If you want to hazard with your life, you certainly find better occasions. The problem is that in the car you are putting life of others into risk.