DEA / Drug Scheduling
I guess you have your own version of history but I like to stick to the facts and the facts are simple.
Marijuana is a contains a dangerous substance and was therefore, placed in Schedule 1 of the contributed substance act back in the 70's.
Cigarettes contain nicotine and aren't controlled for being a dangerous addictive substance. Alcohol has been controlled in the past but it isn't presently listed as a controlled substance.
I agree that you could make a decent argument for scheduling either Alcohol or nicotine but that's not my argument. My argument is that marijuana is a dangerous substance that should NOT be legalized because of high potential for abuse.
In my experience chronic marijuana use or abusecan make a person unmotivated, paranoid, unintelligent and it can lead to unhealthy weight gain. These are all very objectionable qualities that you should want to avoid in life.