1997k-995 adverseeffects baking beverages caffeinehabit carcinogenicity carcinogens coffee congresses cookbooks dieting drugabuse drugs fitness food health healthaspects mate(tea) mescaline methylxanthines nicotine nutrition opium prevention psychotropicdrugs pyruvaldehyde qv107 qv107c1281998 riskassessment safety standards tea theobromine theophylline tobaccouse toxicity toxicology wine