How do they prevent that now? Almost 50% of males aged 18-24 in 1998 admitted to using cannabis within the last 12 months, I bet that number has only gone up. I believe that intoxication isn't an issue, the issue is when that intoxication causes harm. I've seen the effects excess alcohol has on people, vomiting, fighting, crazy emotions etc and people die from drinking too much. Whereas people using cannabis will rarely vomit, will almost never fight, hell it's pretty much the opposite of alcohol. You'd think the lesser of two evils would be encouraged. Legalising won't increase use significantly, the people who wish to use cannabis will continue doing so. The law would just change their criminal status.