Five years ago, pot and other drugs totally destroyed my life. In my case pot was a gateway drug. It also contributed to my not doing anything but sitting at home watching TV. I've since then pretty much quit except for smoking around 5 times. I'm all for experimentation (it's opened my eyes to a lot), and if you can control it, occasional use, but if it becomes a real habit it's a serious problem for a lot of people.
That's the big problem I see in legalizing pot. A lot of people can't control it. I've seen so many people become completely useless, being addicts. I guess it's similar to alcohol, but I see way more burn outs than I do alcoholics.
I always wonder why some societies chose alcohol over marijuana whereas others chose marijuana over alcohol.
...I'll be free of both starting tommorow with my New Year's resolution.