Table 2.

Summary of the clinical trials describing dietary phytochemicals for lung cancer prevention.

Nature Products	Bioactive Components	Classification of Compounds	Dose	Effects and Mechanisms	Ref
Kava	Kava	Mixture	225 mg/d	Increased urinary excretion of total NNAL; Reduced 3-mA	[101]
Cruciferous vegetables	PEITC	Monomeric compound	10 mg dissolved in 1 ml olive oil 4 times/d, lasts 5 days	Reduced NNK metabolic activation ratio; Increased urinary levels of BD-mercapturic acids	[102,103]