Whenever I start training a new class of executives on how to give better presentations, one of them will invariably start by saying, "TJ, I didn't smoke any pot before I came in here today!"

This usually gets a big laugh. The executive is referring to one of the points I make in my book "1001 Ways to wow the Media and Speaking Audiences." Obviously, not that many of my 40-60 year old CEO clients have a big marijuana habit.

At least this way I know my clients have done their homework.

However, these same executives will think nothing of drinking a Starbucks coffee (double the normal amount of caffeine) before speaking. If it is an after dinner presentation where you have to introduce someone briefly, the temptation may be to have a cocktail or two.

I am not about to make you join the Temperance League or swear off all caffeine, but you may wish to abstain from coffee, tea or alcohol immediately prior to a speech or presentation.

Here's why: If you are already nervous and your heart is racing, caffeine will make it race even faster. If you are already stressed, your memory is not going to work at full capacity. You will already be sweating more than usual. Alcohol, even one glass, may make your memory delayed another second or two. A half a bead of sweat may turn into major flop sweat after your gin and tonic, even if alcohol never usually affects you.

If you are at the point in your speaking career where you are so supremely comfortably and confident that speaking is front of a thousand people is as carefree as a walk in the park, then drink whatever you want. But if you still get butterflies in your stomach, why not maximize every factor under your control. Eliminate caffeine, nicotine, alcohol and any other drug from your body unless it is essential in keeping you alive.

Then, once you finish your speech and receive your standing ovation, you can celebrate in any manner you see fit.