Clinical Study: Make Money Smoking Weed 3. Do you smoke marijuana? Have you used in the past 30 days? If so, and you are 18 to 50 years old, you may qualify for a research study evaluating the effects of marijuana on the body. newswatch33 Page 3 Of 8 – Click NEXT To See More! Pages: Page 1, Page 2, Page 3, Page 4, Page 5, Page 6, Page 7, Page 8