I've been camping for about 50 years and in that time I've had old coleman pressurized kerosene stove and lights,( you remember those, the ones that you had to preheat by burning metho in a little bowl around the fuel inlet tube) kerosene "hurricane" lights,gas lights and gas stoves. They have all been used INSIDE tents without any problems.
Rule 1/ keep well away from walls
2/keep on solid non flammable surface as low to ground as possible
3/keep part of tent door or window open at all times for ventilation
4/if you have an infestation of rug rats fence off the stove/heater/light from them
Follow these rules and think and you will be ok