Cigarettes and Marijuana, Why Are Cigarettes Legal?

Millions of people smoke cigarettes. It is unfortunate that I happen to be part of this statistic. Being a smoker, we know the dangers that come with smoking. We know that we can develop serious lung and throat problems or cancer. Most smokers though, don't know some of the products that are in the cigarette they are smoking. Let's start by naming nicotine. Nicotine is probably the only ingredient in a cigarette that a person will remember. It is the most addictive substance in the tobacco. There is more to a cigarette than nicotine and tobacco. For instance if you smoke did you know that you are smoking ammonia, acetone, benzene(used as a solvent in fuels), and carbon monoxide. There's a list of ingredients that go on for days. Can you imagine actually bringing a flame near those ingredients. You might blow up! So tell me something, why are they legal? I mean, I understand that alcohol can kill you but thats only due to being too intoxicated or getting behind the wheel. The purpose of the drinking age is to make sure that more mature people who should understand their limits can drink but young kids who just want to party can't. Even now though, adults do not know their limits or they just don't follow the rules. There are many deaths caused by driving while intoxicated.