This would create selection bias and could be one reason for inconsistent results
To subvert marketing bans, the tobacco industry has shifted to forms of indirect advertising, such as sponsorship of sports or cultural events and viral marketing, including word-of-mouth marketing
[11] Development [edit] When first cast for the role, portraying actor William B
[1] History [edit] In the United States, laws regarding the minimum age to purchase and consume tobacco products have been made by states, territories, the District of Columbia and the federal government
The public health community is divided on this question: Many (though few with specific THR expertise) believe that smokeless products are so dangerous in and of themselves that encouraging their use in lieu of cigarette smoking would be akin to encouraging people to consume arsenic instead of hydrogen cyanide (each of which, incidentally, is present in cigarette smoke)