Well, first, I am NOT a medical professional of any kind let alone a toxicologist. If it were up to me, I would prefer fewer nasties in whatever it was that I were burning. The absolute cleanest you can get? Everclear, 190 proof. It's in drinkable form and contains no denaturants.

However, methanol actually burns pretty cleanly. You'd probably be fine burning methanol so long as the flame were blue.

The main thing about methanol is DO NOT DRINK IN ANY CIRCUMSTANCES. Reasonable care in handling it is fine. It's not sulfuric acid or nerve agent or something.

HJ