What are the agents that cause cancer called?

Neoplasm originates in different types of cancers and spreads as masses of cells into other healthy tissues,which is untrue for . . . . . . .

Match the following columns correctly:

Column-$I$	Column-$II$
$(a)$ Carcinoma	$(i)$ Skin cancer
$(b)$ Sarcoma	$(ii)$ Lymph node cancer
$(c)$ Leukemia	$(iii)$ Lung cancer
$(d)$ Melanoma	$(iv)$ Blood cancer

In cancer,.................. uses strong magnetic fields and non-ionizing radiations to accurately detect pathological and physiological changes in the living tissue.

Which type of cancer is caused by tobacco smoke?

What type of cancer is a $Glioma$?