Having borne down heavily on tobacco, it seems like everyone is now campaigning to make marijuana legal – are they mad?
A libertarian would say that there is no case to ban tobacco (or effectively ban it by draconian taxes on consumption). All tobacco can do is kill you, and as long as you know this you may use it. Marijuana is a different case altogether. It appears that it does not just kill you, it maims you – and not just your body, but you – your personality, your memory, your intelligence, i.e. your essence. And it is particularly attractive to teenagers – those with the most precious and vulnerable brains. Use is increasing in the US and has increased in association with decriminalisation, even if cause and effect is hard to prove. Meanwhile a recent longitudinal cohort study found that persistent cannabis dependence was linked to downward socioeconomic mobility, financial difficulties, workplace problems, and relationship conflict. It gets worse, the concentration of psycogenic compounds is increasing in the plant due to selective breeding. The attitude and fashion among liberal metropolitans “tobacco is vulgar, but marijuana is cool.” Have we gone mad? If we could confine the need to people over 18, and campaign against it, then over time we could reduce use. But a chemical that actually alters the structure of the adolescent brain and is more ubiquitous than boxing? We urgently need more information on the effects legalising cannabis has on usage. Also, more research on its effects on the brain using functional MRI. I wonder if Mendelian randomisation could shed light on causality?
— Richard Lilford, CLAHRC WM Director
- Azofeifa A, Mattson ME, Grant A. Monitoring Marijuana Use In the United States: Challenges in an Evolving Environment. JAMA. 2016; 316:1765-6.
- Cerdá M, Moffitt TE, Meier MH, et al. Persistent Cannabis Dependence and Alcohol Dependence Represent Risks for Midlife Economic and Social Problems: A Longitudinal Cohort Study. Clin Psychol Sci. 2016; 4(6): 1028-46.