Many seniors such as Tommy Chong, 86, of Cheech and Chong fame, are using cannabis though the stoner comedy legend has been an open weed smoker his whole life. Chong has been particularly vocal about using it to get through prostate cancer treatment, which is often widely acceptable for medical use. However, for those new to this habit for recreational purposes, a new study published in JAMA network says that there is a "growing number" of older people developing an "unhealthy relationship" with the drug.