Getting Cancer from eating hot and spicy food is very unlikely and in fact eating hot foods could actually prevent you from getting cancer.
The hot foods have been known to kill off cancer cells so if you do happen to have some cancer cells growing the hot food could likely kill them off and prevent the cancer from ever getting to the point of harming you.
The worse thing that could happen if you eat hot food would be Ulcers and damage to your stomach lining but you'd have to eat too much of the hot food for it to be a problem.
A lot of people enjoy hot foods and spicy foods as well as Jalapeno Peppers and eat them in moderation and never get cancer.
Hot Foods and Spicy foods as well as Jalapeno Peppers are actually a healthy food to eat when eaten in moderation.
I would not worry about getting cancer from the hot food and you probably are preventing cancer when you do consume some hot and spicy foods.