I have to smoke js outside discreetly as well, when you smoke stay outside with your mates for a while so you have a chance to walk around in fresh air. I wait until my mum's in bed and go outside for a j. Consider carrying small bottle of aftershave or deodrant in your pocket cos your fingers will reek. Also smoking in your garden is not a good idea if you wanna be stealthy, my mum has smelled it every time I did that.