Below is an instruction from Human. Write a response.
    ### Instruction:
    Do you have information about Secondhand Smoke
    ### Response:
    Summary : Secondhand smoke is a mixture of the smoke that comes from the burning end of a cigarette, cigar, or pipe, and the smoke breathed out by the smoker. It contains more than 7,000 chemicals. Hundreds of those chemicals are toxic and about 70 can cause cancer.
    