You may have a slipping fan belt or, more likely, an oil leak into the heater core.
car smells of gas inside and out
Your car should not smoke when I accelerate. Maybe it caught fire because you dropped a cigarette. If my car smokes when I accelerate, it's because the piston rings are loose and oil is getting into the combustion chamber.
If your car smells of petrol inside, and you have not been using a petrol-like solvent to clean something inside the car, you probably have a fuel leak and should have the car checked by someone able to detect and fix a leak.
It smells terrible it smells like old gas from the car when people smoke their teeth get ruined
make be there is a gas leak
If your car smells like the inside of a smelly gym shoe, you might need an air ionizer. Not only will it remove the offending smells, but it also works to clean and purify the air inside your car.
Because it's on fire.
A smell inside is usually a bad evaporator coil.
The smoke is actually antifreeze mixed with air. The most common cause of this is a leaky heater core.
because you spilled gas in it
It is possible that the heater core ( the device that heats the air inside the car) is leaking. It is connected to the engine cooling system.
If it is smoke the heater fan motor has failedORElectronics in the heater have failed ORif it smells like anti freeze rather than smoke the heater core has failed.