Who has the right to legalize marijuana?

I presume this title is in the form of a question about who should be allowed to legalize marijuana, in which case, having a question mark at the end may be a good idea.

I asked her opinion about marijuana legalization in Canada.

For regular English verbs like 'ask', be sure to add 'ed' to the end to show it happened in the past.

SheEven though she herself seemed a bit excited and said, most of her colleagues disagreed with it, but could do nothingthe new legislation. Furthermore, despite her colleagues' disagreement, there was nothing they could do about it.

I just reworded the sentence to add some clarifications to make it more clear. For example, when you say 'She seemed a bit excited and said most of her colleagues disagreed with it', it is unclear whether the colleagues are disappointed about the fact that the doctor being happy, or the new marijuana legislation.

I think when itis comes to the uptrend of marijuana legalization, is it important to decide whether it should be categorized as a medical problem or a social issue?.

If it's a medical problem, then doctors make it; otherwise, politicians lobby for regulationshould have the final say on whether marijuana should be legalized. Otherwise, politicians will create legislation based on their own interests.

Who has the right to legalize marijuana?

I asked her opinion about marijuana legalization in Canada.

She seemed a bit excited and said most of her colleagues disagreed with it, but couldn't do noanything.

I thinkwonder if, when itis comes to the uptrend of marijuana legalization, is itt should be categorized as a medical problem or a social issue?

Use "wonder", "think" signifies an opinion

If it's a medical problem, then doctors make itshould decide; otherwise, politicians should lobby for regulations.

Added conditionals with "should" here and in the previous sentence because we are talking about hypotheticals.

I asked for her opinion about marijuanathe legalization of marijuana in Canada.

I think wWhen itis comes to the uptrend of marijuana legalization, is it categorized as a medical problemissue or a social issue?

Run-on sentence if you add "I think" at the start. It's unnecessary to convey what you're thinking about since you pose the question in second clause.
Better also to use "issue" to be consistent

If it's a medical problemissue, then let doctors make itdecisions; otherwise, politicians lobby for regulations.

I asked her opinion about marijuana legalization in Canada.

She seemed a bit excited and said most of her colleagues disagreed with it, but could do nothing.

I think wWhen itis comes to the uptrend of marijuana legalization, is it categorized as a medical problem or a social issue?

If it's a medical problem, then doctors makecan make a decision about it; otherwise, politicians lobby for regulations.