eli5: If tobacco is a leaf, why does it have so many substances known to cause cancer?

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* Source is the packaging I’ve just read for a pack of tobacco in the UK which says it has 70 cancer causing substances

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42 Answers

Anonymous 0 Comments

Something being natural doesn’t mean it is safe for human. Poison Ivy is 100% natural but you probably don’t want it in your bedding, and hemlock is 100% natural, but you don’t want it in your food.

In fact, plants that are toxic to certain animals have that as a built in survival mechanism.

The premise that if X is a leaf, X is safe is just not true

Anonymous 0 Comments

Another “fun” aspect is the polonium-210 content. The high phosphate fertilizer used to grow tobacco is made of a crushed rock. That rock has naturally occurring radium, which decays to polonium. Tobacco is an alpha emitter.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2509609/

Anonymous 0 Comments

Another “fun” aspect is the polonium-210 content. The high phosphate fertilizer used to grow tobacco is made of a crushed rock. That rock has naturally occurring radium, which decays to polonium. Tobacco is an alpha emitter.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2509609/

Anonymous 0 Comments

Another “fun” aspect is the polonium-210 content. The high phosphate fertilizer used to grow tobacco is made of a crushed rock. That rock has naturally occurring radium, which decays to polonium. Tobacco is an alpha emitter.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2509609/

Anonymous 0 Comments

Anytime you burn organic material you produce tons of carcinogenic chemicals. Cigarettes deliver this material straight to your lungs and blood supply.

But we also burn other things, most notably oil/gas/coal and those too create carcinogens which we breath in. The air pollution from fossil fuels [kills millions of people every year](https://seas.harvard.edu/news/2021/02/deaths-fossil-fuel-emissions-higher-previously-thought, which is roughly the same number of deaths tobacco causes each year.

Anonymous 0 Comments

Anytime you burn organic material you produce tons of carcinogenic chemicals. Cigarettes deliver this material straight to your lungs and blood supply.

But we also burn other things, most notably oil/gas/coal and those too create carcinogens which we breath in. The air pollution from fossil fuels [kills millions of people every year](https://seas.harvard.edu/news/2021/02/deaths-fossil-fuel-emissions-higher-previously-thought, which is roughly the same number of deaths tobacco causes each year.

Anonymous 0 Comments

Anytime you burn organic material you produce tons of carcinogenic chemicals. Cigarettes deliver this material straight to your lungs and blood supply.

But we also burn other things, most notably oil/gas/coal and those too create carcinogens which we breath in. The air pollution from fossil fuels [kills millions of people every year](https://seas.harvard.edu/news/2021/02/deaths-fossil-fuel-emissions-higher-previously-thought, which is roughly the same number of deaths tobacco causes each year.

Anonymous 0 Comments

I like campfires. I love the smell of wood smoke. (Not so much when it blows straight in my face.)

Wood smoke is loaded with cancer-causing stuff, but I don’t breath in too much. With tobacco, you are pulling smoke into your lungs, several times a day, every day, for years.

Anonymous 0 Comments

I like campfires. I love the smell of wood smoke. (Not so much when it blows straight in my face.)

Wood smoke is loaded with cancer-causing stuff, but I don’t breath in too much. With tobacco, you are pulling smoke into your lungs, several times a day, every day, for years.

Anonymous 0 Comments

Tobacco isn’t too bad. Nicotine is barely bad at all. Breathing smoke is **definitely** bad, regardless of whether it’s tobacco, random leaves, or really any source. Smoke is *bad* and your lungs are extremely sensitive to it.

Smoking cannabis is just as bad and damaging as smoking cigarettes, but since people who use cannabis generally don’t smoke 20 joints per day it’s less of an issue in practice.