I don’t mind (it) if you smoke.

[diamondcutter]

1. I like it if you smile.

2. I don’t mind if you smoke.
(by me)

If both sentences are correct, I think they have the similar structure. My questions is this:
Can I put a “it” after the verb “mind” in Sentence 2 as follows?

I don’t mind it if you smoke.

 

[tzfujimino]

I've heard/read "I like it when you ..."

 

[emsr2d2]

1. I like it if when you smile.
2. I don’t mind if you smoke.
(by me)

If both sentences are correct, I think they have the a similar structure. My questions is this:
Can I put a “it” after the verb “mind” in sentence 2 as follows?

I don’t mind it if you smoke.

Note my corrections above. I find your version with "it" unnatural. If you change "if" to "when" (as I did in sentence 1), "it" is possible.

 

[probus]

I feel that the "it" was always used back when I was young. More recently it has become optional, at least in AmE.

 

[diamondcutter]

Hi, Probus.

Do you mean the "it" in both sentences in #1 was always used in the past and is optional now in AmE?

 

[probus]

Hi, Probus.

Do you mean the "it" in both sentences in #1 was always used in the past and is optional now in AmE?

Both sentences.

 

[jutfrank]

I'd say that sentence 1 is wrong (you mean when, not if) and that sentence 2 is okay as it stands, but wrong with it.

 

[Tdol]

As a former smoker, I'd suggest laying off allowing smoking.