Cannabis smoke shares many of the same toxins and carcinogens as tobacco smoke. Tunatura/iStock via Getty Images PlusThough tobacco use is declining among adults in the U.S., cannabis use is increasing. Laws and policies regulating the use of tobacco and cannabis are also moving in different directions. Tobacco policies are becoming more restrictive, with bans on smoking in public places and limits on sales, such as statewide bans on flavored products. In contrast, more states are legalizing can