im all for legalization, but decriminalization would be the first, vital step.
marijuana should be sold to adults (varying from countries, 21 or 18 years of age), it should be government checked, as food is checked, as alcohol is checked etc.,
there is of course the chance of abuse, but hey, isn't that a problem with EVERY substance?
there are people who drink one cup of coffee a day, and plenty of water, which suggests virtually no damage to the body.
others on the other hand drink coffee hourly, over years, which may lead to blood vessel damage, failure of particular healing processes within the body (for example eczema, dermatitis, acne).
one person may drink a beer every now and then after work or a martini after a job promotion.
another starts drinking at 10 in the morning. every morning.
you can find examples like this for every product anywhere in the world, so i don't think that argument should be limited to cannabis.
i don't smoke alot of weed, i smoke every couple of weeks, sometimes i even stay "clean" for months at a time.
do it responsibly and in moderation and marijuana will remain to be an undescribable experience, a peaceful journey and the most fun you've had in years =)