The most well known stereotype that stoners deal with is that we're lazy. We smoke too much bud to do anything but sit around and stare off in to space. Fortunately for us, that's not the truth anymore. Potheads have worked very hard in order to negate that stereotype and we have done a very good job of it. Stoners have managed to infiltrate almost every career path, from retail to engineering. Stoners work far harder than anyone at excelling because the bar has been set so high. No pun intended.
The first step to being a productive pothead is knowing how to handle yourself when you're sober and when you're stoned. Being able to function in both states of mind is key, although there are some people who are only able to function extremely well when they are high. You should be able to tell when you've smoked enough, whether or not you can handle being high at work, and if being stoned while on the job is safe for you and your coworkers. By knowing your limits and exhibiting self control, one can smoke and hold at job, while sometimes even excelling. It goes back to the very popular saying "If you're lazy when you smoke weed, you were lazy before you smoked".
To be a productive pothead, one must find something they love. Smoking is said to be a huge enlightenment on your mind, opening the smoker's eyes to new possibilities and scenarios. If you're stuck in a mundane job that you don't enjoy, smoking is going to make you dislike it even more. But if, every day, you make money by working at something that you really enjoy, the weed will only enhance that job and make being there better, as well as make the work you do better. And if you can't do what you love right now, start working towards it. It may take a while or it may take a few months but keeping yourself motivated is important.
Marijuana is a privilege. The plant should be used to make life better, rather than to hinder it. If you can't smoke and be productive, then you really shouldn't be smoking. Self control is extremely important, just as important as debunking the lazy stoner" stereotype. We are not lazy and it sure is offensive to be called as such. There are some stoners that work harder than any of the people around them, smokers and non smokers alike. Proving that we are productive and motivated will only further marijuana acceptance.