Cannabis is the most commonly used drug in the UK after alcohol and tobacco, however only 1 in 8 adults and 1 in 5 young people have admitted to using it in the last year (FRANK, 2013). The main active ingredients in cannabis are delta-9-tetrahydrocannabinol (THC) and this is what causes the ‘high’ and cannabidiol (CBD) which acts as a counterbalance, making you feel alert and creative (Alexandrou, 2011). THC is the main ingredient which has been linked to causing long-term neuropsychological damage. During the past 10 years, stronger strains of cannabis have become more popular, with an increase from 6% to 16 % THC with less CBD (Alexandrou, 2011). This is thought to have caused an increase in cannabis related neuropsychological harm. Much of the leading research into the long-term effects of marijuana, suggests that regular, long-term use of marijuana leads to deficits in IQ, executive functioning, motor and learning skills and short-term memory loss(Grant, Gonzalez, Carey, Natarajan, & Wolfson, 2003; Pope, Gruber,& Yurgelun-Todd, 1995; Pope, Gruber, Hudson, Huestis, & Yurgelun-Todd, 2001; Solowij & Battisti, 2008; Grant et al., 2003; as cited by Nehal P. Vadhan, Wilfred G. van Gorp, and Frances R. Levin 2011; Solowij, 2002; Harvey, Sellman, Porter & Frampton, 2007). However, there are debates among the critics as to how ‘long-term’ these effects are, who they are most likely to affect and the cause of the neuropsychological damage.…