A hypothetical question about legality and drugs.

I've been thinking recently about drugs and their current state of legality in our government (USA, although other countries could very well be involved in some way, just in a different format). Currently, in America, these are the drugs that are illegal in the US. Each of them have different characteristics that carry them to specific schedules in which they are placed to serve as the most harmful to least harmless substances, among other things.

Now, the situation which I would like to purpose is this:

If these drugs were to be legalized, and corporations were established to sponsor their use in controlled environments, would you vote for/support it? This could be an example of what i mean by 'controlled environments'.

So, I'm aware why most people support it, many think our country should legalize certain types of, if not all drugs (among other things). These people (I'm talking the majority of the people with sensible opinions formed by research etc.) support this for one main reason, they think people should be allowed to do whatever they want to themselves as long as it doesn't hurt other people.

People against this movement (if you want to call it that) think that it if the currently legal drugs we know of were to be legalized, could potentially harm others' life, liberty, and pursuit of happiness. But, in the hypothetical situation I purposed, most (maybe even all) of these actions that could potentially disrupt one's right to life, liberty, and pursuit of happiness wouldn't be a problem any more (at least, that's the idea).

I've actually talked to my friends about this, and they think that people should be allowed to do whatever they want. Again though, the point came up that someone that drinks by themselves one night could easily stumble into his/her car and wreck into another and crash and kill that person. Obviously, that situation would be robbing the person who dies of their life.

So, what do you guys think?

tl;dr If illegal drugs were to be legalized, and corporations were established to sponsor their use in controlled environments would you vote for/support it?

Also, if anyone needs me to clarify anything, please ask.