why do onions make you cry ? )':

when you cut into an onion you break the cells releasing their contents. amino acid sulfoxides from sulfenric acids. enzymes that were kept sepreated now are free to mix with sulfenic acids to produce propanethiol s-oxide, a volatile sulfur compound that float upward towards your eyes.
the gas reacts with the water in your tears to form the sulfuric acid then the sulfuric acid acid burns stimulating your eyes to release more tears to wash the irritation away. once the onion is being cooked it doesn't create your eyes to tear up even though the smell is not pleasant. the sulfur compound also leaves a odor in you fingers which can be hard to be removed. 

 when you count into an onion you break cells releasing their contents. they are amino acids sulfoxides from sulfenic acid. enzymes that were kept separated now are free to mix with thee sulfenic acids to produce propanethiol s-oxide a volatile sulfur compound that floats upwards towards your eyes.he cells are divided into two sections separated by a membrane. One side of the membrane contains an enzyme which helps chemical processes occur in your body. The other side of the membrane contains molecules that contain sulfur.


so if you ever wondered why yours burn or start to tear up when your around onions its a chemical reaction, some people dont tear up when they're around onions but most do.

The Addiction Of Smoking !

 

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what makes smoking addictive? What makes smoking addictive is the addictive compound with both stimulant and depressant properties witch is nicotine. nicotine causes chemical or biological changes to the brain. it mainly affect chemicals called dopamine and noradrenaline , when nicotine changes the level of these chemicals your mood changes and most people like the feeling. once someone is used too the feeling they have to smoke more and more to keep them happy and feeling good.

people that try to quit because they know the nicotine is no good for them but it can be hard once your brain is used to having it. they get anxious and depressed and have no choice but to smoke unless they get help. the brain is used to having the nicotine running through it and once it has it, it is hard to get rid of it.

once you take one pull of a cigarette the nicotine is rushed to your brain with in 10 seconds.  i think people who smoke should have never started smoking in the first place because they no its no good. but like it says it helps relieve stress and depression. the older you are the harder it gets to quit depending on how long you been using it.