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White smoke is water in the combustion, water will stop the ignition and the fuel in that/those cylinder(s) will not burn, hence the gas smell.

Here is what I would do.

Check the plugs, easy to tell if you find a wet one, or two. Note the cylinder where you find the wet plugs

A compression check will tell you if the head gasket is gone, if the compression looks good, you have a bad intake gasket.
 
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