When you have to cough while smoking weed, never hold it in just because no one else has coughed. If you have to cough, cough (You get more stoned after you cough anyways).

Avoid coughing - it diminishes the Zen quality of herbalizing. If you feel your lungs beginning to burst, slowly and steadily exhale the smoke until the pressure subsides. A "controlled cough" is accepted because it can get you even higher.

Cover your mouth when the hit kicks your ass and you start coughing and spitting all over the place!!