Why do plants produce tar when burned, like tobacco, pot, tea and others.?

becouse these plants may not originally contain these substances in them, or do thay?

Answers:
Because when the hydrogen, oxygen and carbon have been burned away, there are still trace amounts of nitrogen, calcium, silicon, phosphorus, zinc, magnesium and a bunch of other elements that have not burned away.
i think its the burnt chlorophyll in them
The tar you are referring to is a complex mixture of (mostly) carbon compounds produced by high temperature pyrolysis reactions. It will vary in composition considerably with the type of plant.
"Tar" is the product of incomplete combustion of organic molecules. Therefore, anything made of/containing organic molecules will produce "tar" if heated without enough oxygen to oxidise all of it.
Pine wood has a sap that is very sticky .. not sure if you can call it Tar . But it burns very bright and is great for BBQ's..
Also Silver Burch tree in the summer has a very sweet sugar type sap that is very nice to drink ,,, but is also very flammable , Still not sure if you can call this a Tar .as Tar is a Residue left from burnt wood ..etc.

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