I have smoke coming from the tail pipe and it smells like gas what could be the problem

what smokes. we are blind here.
you must stay.

1: end of tail pipe smokes
2: or, with hood up the exhaust manifold smokes due to oil we dropped there. (common on much service)
and what color is it.?
from where.?
tail pipe can do 3 colors
white goes away fast ,called steam.
white stays way too long called burned oil smoke,
and black (unburned fuel) and smells like gas..

Failed fuel pump -check the pressure at the motor

Smoke from tail pipe or smoke from under hood?
A general rule of thumb if it is coming from tail pipe the color of smoke will tell you a lot.

White and thick means head gasket failure, Blue means oil is being burned.

I would recommend you check the seal of everything and make sure it is cleaned that had to do with vacuum or fuel distribution. EGR valve (gasket fails sometimes) IAC valve, MAP and MAF sensors, Fuel injectors, FPR (this will need replaced if leaking),

Also check you coolant and oil look for signs of either one mixing with one another, smell you coolant and make sure it don't smell like gas either, look around where the head meets the block and make sure you don't have any coolant leaking there. The smoke if from the tail pipe makes me think head gasket and these are simple checks. They are not 100% diagnosis but can lead you to the problem.

Also one obvious thing would be make sure no one put anything in your gas tank.

I would most likely look at the injectors first then the head gasket next.

Hello;Are there any service lights on in dash?It could be that the fuel pressure valve went bad,causing it to get to much fuel, and thats were the black smoke is coming from.

Please post other info. model, mileage, engine size, year, any work done to it recently?

your tail pipe is always going to smell like gas the white smoke is oil being burned from worn out valve guides or rings.

If the smoke comming from the tail pipe is black your running rich. If thats the case the entire fuel system has to be ckecked out. Injectors could be leaking, a bad pressure regulator,stuck return line ,a coolant temp sensor could be telling the ECU that the engines cold give her more gas. I don't recommend doing fuel service unless your qualified to do so for the obvious reasons.
If the smoke coming out of the tail is grayish you have a bad head gasket. If the smoke coming out of the tail is blue you have engine oil getting into the combustion chamber. keep me posted

Chances are it is water coming out this is normal to notice some water dripping out of exhaust periodically as the car runs, If the liquid actually smells like gas i am at a lose I have never heard of this occuring.

with smoke mean time to replace engine valve is bad and oil is mixing with coolant internally

Check the fuel pressure regulator. It should have a vacuum line attached to it - disconnect the vacuum line and turn the ignition on - if fuel come out then that's your problem. DON"T do this while the engine is hot or you could start a fire!