Odds are the grower would not abandon it if his plants are as large as you say.... maybe leave it for a while til the heat cools down, but it is in his interest to go back to it more than it is yours. He would also not appreciate you smoking with him or communicating what-so-ever with him - that is just too sketchy. It's hard not to be awestruck by a thing of beauty, but that dude has loved his plants since they were seedlings, you just came upon them and want to hijack his grow. Grow your own and hope that one day if anyone comes across yours they are as kind to you as you were to that man. Resist your thieving temptations and you will be better for it, even if nobody but yourself knows the true depth of your honesty and integrity. Leaving any sign that you were there, such as taking cuttings, would send chills down any growers spine.