You say there is no tar in smoking. The term "tar" is a deceitful antismoking propaganda label for microscopic particles of organic molecules in tobacco smoke. While one can
condense such molecules into a tar, that would be like calling a cloud in the sky a 'mud puddle' or 'cesspool'. Or calling some food you disapprove of 'feces' -- while it is true that it can easily be turned into 'feces', that kind of characterization tells reader more about how you feel about it rather than about the particular food itself.
I smoked years ago at age 19 with a friend. We went stupid and smoked one smoke after another chain smoking. I didn't stop until I started feeling odd, far away and nauseous. The feeling was frightening and finally I was overtaken with salivating uncontrollably and hit by extreme nausea. I ran and vomited up blood and a dark brown, almost black like liquid.. ... What you describe is a classical nicotine poisoning. It is seen most often in tobacco farm workers where it is known as
"Green tobacco sickness". It doesn't normally occur with smoking since it takes great deal of willing foolishness to overdose that way, while going against all the unpleasant warning signs, yelling at you "stop it", which precede the toxic dose well ahead of the genuine danger. It can be done through smoking, of course, with a right mix of testosterone, alcohol and youthful foolishness, but it isn't easy or common.
There was recently a news story about a contest organized by a radio station, in which the winner (of a computer game) is the person who can drink the most water before taking a leak. Dozens of fools came in, tortured themselves with a gallon or more of bottled water, the healthiest kind the organizers could find. The participants all went through a horrible torture (vomiting, nausea, heart racing,...) which became much worse in hours after the contest was well over. One previously healthy young woman who participated died that night. The radio station fired the young dj's who came up with the contest idea. The woman's family is suing the station.
The moral of the story -- you can take just about anything in your kitchen, ingest it well beyond the natural warning signs to stop, and you will reach the
toxic dose, suffer great deal and likely endanger your life. Even
breathing quickly the plain, clean air (to say nothing of inhaling a pure oxygen) will cause contraction of the arteries in your brain, as your body tries desperately to cut down on oxygen overdose, and at best you will just black out before you can harm yoursef further and then wake up with a bad headache. At worst you will end up with a stroke and possibly die.
As to the gunk you vomited, that certainly was not "tar" but something you had in your stomach. As explained above, you inhale microscopic particles in very small quantity, about 25 mg per cigarette of which less than 20% is absorbed by your lungs, hence there are under 5 mg of absorbed matter per cigarette (for comparison, a glass of juice has 200,000-300,000 mg of matter) or it takes about 200 cigarettes, 1 carton, to absorb 1 gram of tobacco smoke matter into your bloodstream, or 200-300 cartons of cigarettes to absorb as much matter as you do from one glass of juice. You ingest many thousands of times more matter, the "chemicals", including any pesticides, chemical additives, mercury, lead, polonium Po 210 from fertilizers,...etc from your food and drinks than from cigarettes.
These absorbed molecules end up in your bloodstream, not your stomach, and require detailed chemical analysis to detect i.e. they are not visible to the naked eye, not even through a microscope.
