Did you have any bad experiances in the past with hard liquor? I found that after this one night I can't drink vodka without blowin chunks. If you get the reflex of gagging while taking the shot then thats your own body rejecting it. It has nothing, and note this, nothing to do with weed. If you were high while you try and take shots then perhaps this would be debatable but as it stands... your body just can't take it.