The density of the blade is constant throughout its length, and so a 10%-mass. fragment will have a cross-sectional area of 10% of the full blade. In practice, the. area of a 10%-mass fragment will vary depending upon its shape, and upon whether. it consists of the only the outer shell or the internal beams as well.
Marijuana use ranks second behind alcohol in regards to the most commonly abused drugs by teenagers. There has been an increase in marijuana use among teenagers due to the increasing societal attitudes towards tolerance and perceptions that marijuana is not a dangerous drug.
Marijuana also was the most commonly used drug among 16 or 17 year olds (12.7 percent); it was followed by prescription-type drugs used nonmedically (4.0 percent), hallucinogens (1.6 percent), cocaine (0.7 percent), and inhalants (0.7 percent).rug Teenâs are Most Likely to use the First Time Trying or Using a Drug in 2008: In 2008, of the 2.9 million persons aged 12 or older who used illicit drugs for the first time, within the past 12 months, a majority reported that their first drug was marijuana (56.6 percent).