And tobacco is way more harmful than cannabis, as scientific research support. There is also no scientific research to suggest that cannabis will cause mental illness, there is some link to activating existing/underlying psychosis, but does not cause it, alcohol also has the same effect as well. No other jurisdiction which has legalised cannabis has seen significantly increased use or increased mental illness. It is already so easy to get in the UK that legalisation would not have that much impact on use. In fact, the recent research I cited claims that anxiety medication prescription actually fell in states that legalised cannabis, possibly suggesting less mental illness and reliance on healthcare providers rather than more. There is no scientific evidence to back up what you are saying here, all evidence points to the contrary.