Lethal illegal cigarettes - containing rat poison and dead flies - were sold to investigators during a secret undercover probe
The cellulose acetate flakes are then dissolved in acetone and spun into long threads, which you can see clearly when you take apart a filter cigarette
Several medications are successfully used to help smokers quit the habit, especially in a physician-monitored program
Reviewed by Jason Shackelford This article was reviewed by Jason Shackelford
International review of neurobiology , 124 , 171208
That's partly because under federal law, cannabis is a Schedule I substance, meaning it has "no currently accepted medical use and a high potential for abuse." That designation places numerous restrictions on researchers, making it difficult to carry out rigorous research on marijuana