Answer :
(1) The chemicals in tobacco can cause the cells to mutate in a way that they start dividing uncontrollably and also loses the potential to fight from the damage. (2) Tobacco is a mutagen because it changes the sequence of DNA that results in mutation. (3) Cigarettes contain multiple mutagens. (4) Smoking one cigarette may or may not cause cancer but it definitely has adverse effects on the body.
Tobacco is the common name of the plant Nicotiana. The chemicals present in tobacco leaves are quite harmful and can cause severe disorders including cancer, addiction, etc.
Mutagens are the agents that induce mutation into the genetic content of an organism. These can be physical, chemical or even biological.
To know more about mutagens, here
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