According to the Research on Nicotine and Cigarette Smoking,which of the Following

According to the research on nicotine and cigarette smoking,which of the following statements is FALSE?

A) In large doses nicotine causes stomach pain,vomiting and diarrhea,cold sweats,dizziness,confusion,and muscle tremors.
B) The use of smokeless tobacco,such as chewing tobacco and snuff,have not been shown to cause any cancers at this time.
C) Smoking is the leading cause of preventable deaths worldwide.
D) Secondary smoke causes about 3,500 lung cancer deaths and as many as 70,000 heart disease deaths each year in the United States alone.