Good info above.

My 2 cents:

Be careful if he goes to see a doctor or psych. Every doctor these days is paid to write dangerous prescriptions that are way more detrimental than anything weed can do. AVOID PRESCRIPTIONS!!! especially psych medicines...very scary.

If he is into making money...make sure it's with a good job and not as a drug dealer. 18 years old. that kid has a long life ahead of him. Dealing at such a young age (or any age.,.) instills the wrong sense of work ethic. Also, if he is dealing and just starting out...man...let's hope he's got A LOT of street smarts.

Weed is not harmful. Making money with weed can easily be harmful.

good luck.
skeet