1. For legalisation 
Claim:
Cannabis can help people with illnesses such as multiple sclerosis and Alzheimer's. 1
Evidence:

2. For legalisation 
Claim:
If cannabis was legal then less young people would start using it. 2
Evidence:

3. For legalisation 
Claim:
If cannabis was legal then the police would have more time to do other, more important things than arresting people for possession of cannabis. 3
Evidence:

4. For legalisation 
Claim:
If the government legalised cannabis they could tax it and make a lot of useful money for the country. 4
Evidence:

5.  Claim: Using cannabis leads to mental illness. Against legalisation5
Evidence:

6.  Claim: Smoking cannabis leads to more diseases than smoking tobacco.
Against legalisation 
Claim:
Smoking cannabis leads to more diseases than smoking tobacco. 6
Evidence:

7. Against legalisation 
Claim:
If young people start using cannabis, they are more likely to start using hard drugs like heroin. 7
Evidence:

8. Against legalisation 
Claim:
If cannabis was legalised then more young people would start using it. 8
Evidence:

9. Claim 1 http://www.newscientist.com/article.ns?id=dn6387
Claim 2
Claim 3
Claim 4
Claim 5
Claim 6
Claim 7
Claim 8