marijuana industry10 Top Marijuana Penny Stocks to Watch Before 2018 October 5, 2017 by Alex McGuire The top marijuana penny stocks to watch in 2018 include some of 2017's biggest gainers. While these stocks have gained as much as 5,400%, we're not recommending you buy any of them today. Instead, we're going to show you the best marijuana stock to buy in the high-growth hydroponics sector...