The purpose of this study is to estimate nicotine uptake and assess subjective effects during ad lib use sessions of an electronic nicotine delivery system with multiple flavors and nicotine concentrations as compared to an e-cigarette, conventional cigarettes, and nicotine gum in adult smokers ages 21 to 65.
The purpose of this study is to evaluate the safety and effectiveness of an investigational, oral drug for celiac disease to see if it can reduce the symptoms of celiac disease (such as abdominal pain, diarrhea, bloating, cramping, and gas) as compared to a placebo.
The purpose of this study is to evaluate biomarkers of exposure and potential harm between those who smoke conventional cigarettes and those who switch to an investigational e-cigarette.
