While Thai people know a lot about the harm of 1st hand smoking and 2nd hand smoking, a lot of people still have no idea what third-hand smoking is or what it could do to non-smokers people. Especially those who smokes inside their own home without knowing that even if they avoid smoking around those they love, their non-smoking family members still can get harm by tobacco residue that is left on objects in the house after someone smokes, which is known as third-hand smoking.