I've thrown up from tobacco before people... Rolled a very loose cig and smoked it all without taking a breath of air, just a drag then exhale then another drag without breathing any air. Well after I was done I had a headache so I finished off my paper round (oh yeh I forgot to say, I was on my paper round), then I got home and my mouth started watering like crazy and I knew I was going to throw up, and alas, I did. lol!