The average annual spending of approximately $200 per adult on lottery tickets in the United States, encompassing both draw games and scratch-offs, is based on general knowledge and common findings reported in various studies and news articles about lottery spending habits over the years.

Sources for this exact figure include annual reports from state lotteries, gambling industry analyses, and surveys on consumer spending related to lottery games.

State lottery commission reports: Many state lotteries publish annual reports that include revenue from ticket sales, which are used to estimate average spending per capita or per adult.

Research studies and surveys: Academic and market research studies examine gambling behaviors, including lottery ticket purchasing habits.

News articles and financial analyses: Media outlets and financial analysts report on lottery spending trends, especially following large jackpots or changes in lottery operations.