How long should I abstain from drugs/alcohol before trying to conceive (for a male)?

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I occassionally use drugs like marijuana or spice, and drink from time to time. My wife and I are talking about trying for a baby in the semi-near future. I don’t want to endanger the baby by being irresponsible. How long should I be totally clean before trying to conceive?
Serious answers only please. I’m looking for X amount of days, if possible, so I can set a clear date.

I believe marijuana takes about a month to get out of your system, I could be wrong but thats what I’ve heard from people who wanted to pass a drug test. So I would assume about a month and it would be out of your system so you guys and start trying. Good luck!
oh heres something I read:
According to the website of Columbia University’s Health Services:
Marijuana itself does not "stay" in your system, but the main chemical in marijuana, THC, does. It fact, it may stay in your system forever because it is stored in fatty tissues of various organs.
Frequent users urine drug test
THC by-product: 2 weeks to a month after smoking (3 months for extremely heavy users)
I am NOT sure of an actual amount of days…I know u asked for only answers that could provide that, but i would like to commend you for planning to quit for your future child! He/She will have a great Daddy! Good luck and congrats when it happens.
I know neither of these cause you to be sterile it just weakens everything. Sorry I dont know more!