From Wikipedia's cannabis laws by country:
Estonia:
Possession: Illegal (Decriminalized)
Sale, Transport, and Cultivation: Illegal.
Consequences: Up to 10 grams is considered an amount for personal use, and is punished with a fine. Large amounts and distribution are criminal offences, and are punishable with a fine or by up to 5 years in prison
From the peanut gallery (me): Seems like the laws could be a lot harsher, definitely doesn't seem as sketchy as some southeast Asian countries like Indonesia where you can get life for possession. Depends on what enforcement is like where you live, and what you are comfortable with. I have been a long time smoker but I never grew until I got my medical card and could do it legal because I'm paranoid and I don't like having to keep secrets, it's bad for the blood pressure.