Need help with smoking!?

ok so my parents are like private investigators on my life and need to know every detail. they told me recently that they dont care if i drink, they just dont want me smoking, but ive done it a few times anfd like it. And my problem is idk how to. i reeked of weed after one time i did it, and threw my clothes out. the only thing i can think of is to stay the night at a friends house when they have a party so i can change my clothes and clear out my eyes, but they usually dont let me stay at parties. how can i convincve them, or how can i smoke and get away with it when i have to go home?