Could Caesar Clown have controlled Smoker? Smoker is a smoke man. He can "create, control, and transform into smoke at will" – One Piece wiki

Caesar is a gas man. He can "create, manipulate, and transform into gas at will." – One Piece wiki

Since smoke is a gas, could Caesar control Smoker when he turns into smoke?
The powers of Gasu Gasu no Mi would certainly allow Caesar Clown to control Smoker when he transforms into smoke using Moku Moku no Mi's powers, provided the smoke is within Caesar's range. 

However, Smoker would not be totally helpless if they fought one-on-one since he can fight without using his Moku Moku no Mi powers at all. He can use Haki, and carries the Kairoseki Jitte, both of which would be effective against Caesar.