You understand are bringing the skepticism of a quack author here? It's kinda funny having you sound like
@Eenie-Meenie or
@babe has hacked your account. Careful, they might fall in love reading this from you
Do you have any reason to not believe something that is universally accepted, and for solid reasons? Claiming the sanctions aren't working now or haven't in the past is simply absurdity.
I'm not taking the current words from a fanatical religious country over the US intelligence agencies. Iran threatened to do this.
“America should know that we are selling our oil and will continue to sell our oil and they are not able to stop our oil exports. If one day they want to prevent the export of Iran’s oil, then no oil will be exported from the Persian Gulf,”. -President Rouhani
Not sure of your position because it's out of context. So you are putting the onus for the problem on Iran? If you are, I think you ought to go back into history, and learn about when our CIA led a coup that toppled their democratically-elected leader, Moseddegn and replaced him with the Shah in 1953, to maintain our geopolitical control of international oil sales. We've been trying to overthrow the current government for many years. You know about the Jerry Sterling, whistleblower case. Look it up. It's very pertinent to what's happening now.
Since 1979. Sanction isn't a blanket term. Sanctions are not all equal. Obama's were draconian. Trump's moreso.
The ability to refine uranium on their own soil, getting them closer to their goal of having warheads within ten years.
For this question to have merit, the humanitarian exceptions and oil export exceptions would have to allow a large enough amount of trade to render the loss of 1.8 mmbpd, or 65% of all oil exports, a drop in the bucket. They aren't.
Plus, Trump did not renew the waivers China and other countries were importing Iranian oil under. That was on April 22 and exports are set to drop even further. These attacks followed, just as Iran threatened. For context on why now: Oil exports in March: 1.86 mmbpd. Oil exports in April: 938 kbpd. Even China went along with the waivers expiring by dropping imports by over 1/2 m-o-m.
I'm still waiting on where you are getting this. You don't normally make strong claims without good reason so I went searching. I found nothing.
Here's some light reading on the effects:
https://www.google.com/amp/s/en.radiofarda.com/amp/29901117.html