if you are just worried about how long that will stay in your system then you have some problems. I'd worry about the actual crack smoking part! Why would you even smoke crack?
3 days
The nicotine chemical is usually out of one's system in 48 to 72 hours. After a year you will be no more likely to suffer heart failure than someone who has never smoked, generally.
A maximum of a month.
For a month. The amount you smoked doesn't change the fact it is there.
Your system should be clean if no other use during the last month.
In roughly one month.
That depends on how much you've smoked and for how long. If you smoked a couple of times a week you would expect it to be out of your system within a month.
Doesn't matter how long since you last smoked. Weed stays in your system from 2 weeks to a month.
Weed laced with crack presents you with two problems: weed stays around for up to a month, crack stays around for about a week.
yes
If its the only time you smoked all month, 15-30 days.
Tuesday or Thursday? I'm pretty sure it would take about the same amount of time as if it was smoked on either day. 3 days for a standard urine test, 1 month for a blood test, or as long as you have hair for a hair test. That being said, crack is a terrible drug with side effects that just make it not worth it. Just don't smoke it and you don't need to worry about passing a blood test. :)