Marijuana Long-Term Side Effects — Texas DWI and Repeat Offender Risks
Co-Founding Partners
Texas Bar verified. Reggie London (Texas Bar No. 24043514) and Njeri London (Texas Bar No. 24043266) are the co-founding partners of L and L Law Group, PLLC — based at 5899 Preston Rd, Suite 101 in Frisco, Texas (Collin County), with many 5-star Google reviews, and available 24/7 for criminal defense consultations.
Table of Contents
Cognitive and psychiatric effects
Long-term cannabis use produces:
- Cognitive effects. Memory and attention impairment, particularly in heavy users. Substantially reversible with sustained cessation but some persistent effects documented
- Adolescent brain development concerns. Use during adolescence associated with persistent cognitive effects more pronounced than adult-onset use
- Cannabis use disorder. 9% lifetime risk among users; 17% if use begins in adolescence
- Cannabis-induced psychosis. Acute psychotic episodes from heavy use, particularly high-THC products
- Schizophrenia risk. Increased risk in genetically predisposed individuals; debate continues about causation vs. association
- Anxiety and depression. Bidirectional relationship — cannabis can produce or worsen anxiety/depression; people with anxiety/depression are more likely to use cannabis
- Amotivational syndrome. Reduced goal-directed behavior in chronic heavy users
- Cannabis hyperemesis syndrome. Cyclic severe vomiting in some chronic users; only resolves with cannabis cessation
Physical health effects
- Pulmonary effects (smoked cannabis). Chronic bronchitis, increased risk of respiratory infections; lung cancer risk less clear than tobacco
- Cardiovascular effects. Increased heart rate during acute use; some evidence of increased cardiovascular event risk in chronic users
- Cannabis use disorder. Withdrawal symptoms include irritability, sleep disturbance, decreased appetite, restlessness
- Edible-specific risks. Severe acute reactions, hospital visits from overconsumption
- Pregnancy effects. Low birth weight, possible developmental effects
- Reproductive effects. Reduced sperm count, hormonal effects in chronic users
- Dependence. Physical and psychological dependence in chronic heavy users
Texas charging — escalating for repeat offenders
Texas marijuana law varies by form:
- Whole-plant marijuana (Penalty Group 1-A under §481.121): Class B misdemeanor (less than 2 oz), Class A (2-4 oz), state jail felony (4 oz – 5 lb), third-degree felony (5-50 lb), second-degree felony (50-2,000 lb), enhanced first-degree (over 2,000 lb)
- THC concentrates (Penalty Group 2 under §481.103): State jail felony minimum for any amount under §481.116. Edibles, vape cartridges, oils, wax, shatter all fall here
- Marijuana DWI: Texas Penal Code §49.04 applies to any impairing substance; THC-DWI follows standard DWI escalation
Repeat offender enhancements:
- Class B → Class A with prior conviction
- State jail felony enhanced to third-degree with prior state jail felony for drug offense
- Habitual offender status (§12.42) with two prior sequential felonies
Hemp defense and lab confirmation
Since 2019 Texas hemp legalization, the prosecution must quantitatively confirm Delta-9 THC content above 0.3% to prove marijuana. Practical implications:
- DPS lab quantitative testing required
- Many smaller marijuana cases declined for prosecution due to testing capacity limitations
- Hemp-derived products (CBD with trace THC) can produce ambiguous test results
- Defense angle: challenge prosecution's ability to prove substance is marijuana, not hemp
This has substantially reduced marijuana prosecutions in many Texas counties, but it has not affected:
- THC concentrate charges (treated as Penalty Group 2, separate from §481.121)
- Larger quantity cases where lab testing is proportionate to charge
- Distribution and commercial cases
- DWI cases where impairment is the question, not substance identity
Texas Marijuana Charges by Weight
| Weight | Offense | Range |
|---|---|---|
| Under 2 oz | Class B misdemeanor | Up to 180 days + $2,000 |
| 2-4 oz | Class A misdemeanor | Up to 1 year + $4,000 |
| 4 oz - 5 lb | State jail felony | 180 days-2 years + $10K |
| 5-50 lb | 3rd degree felony | 2-10 years + $10K |
| 50-2,000 lb | 2nd degree felony | 2-20 years + $10K |
| 2,000+ lb | Enhanced 1st degree | 5-99 years/life + $50K |
| Hemp products with delta-9 THC ≤ 0.3% are legal under HB 1325 (2019) | ||
Have a Texas legal question?
Call L and L Law Group for a free, confidential consultation. We handle criminal defense across Collin, Dallas, Denton, and Tarrant counties.
Call (972) 370-5060In our practice defending Texas criminal cases, we have represented clients in Collin, Dallas, Denton, and Tarrant County criminal courts on the full Texas Penal Code and Health & Safety Code spectrum. Reggie's prosecutor background in Dallas County means we know the State's evidentiary playbook; Njeri's trial-trained motion practice anchors the suppression-driven defense work.
Key Legal Terms
- Penalty Group
- Texas Health & Safety Code § 481.102-481.105 classification of controlled substances by abuse potential and accepted medical use. Determines weight tiers and punishment ranges.
- Article 38.23
- Texas Code of Criminal Procedure exclusionary rule. Evidence obtained in violation of any federal or Texas constitutional or statutory provision is inadmissible against the accused.
- Aggregation
- Texas H&S § 481.002(5) rule that the total weight of any controlled substance, including adulterants and dilutants, counts toward the offense weight tier.
- 3g Offense
- CCP Article 42A.054 list of offenses ineligible for judicial probation and requiring 50% sentence served before parole eligibility (formerly Article 42.12 § 3g).
- Pretrial Diversion
- Pre-charge alternative under CCP Article 32.02 in which the prosecution agrees to dismiss charges upon successful completion of conditions (counseling, community service, restitution).
Frequently Asked Questions
What are the long-term effects of marijuana use?
Cognitive effects (memory, attention) substantially reversible with cessation; cannabis use disorder in 9% of users; cannabis-induced psychosis; pulmonary effects (smoked); cannabis hyperemesis syndrome; cardiovascular effects; reproductive effects; pregnancy effects.
Is marijuana addictive?
Yes — cannabis use disorder is a recognized DSM-5 diagnosis. Lifetime prevalence about 9% among users; higher (17%) if use begins in adolescence. Physical and psychological dependence documented in chronic heavy users.
Is marijuana a felony in Texas?
Depends on form and quantity. Whole-plant marijuana: misdemeanor under 4 oz, felony 4 oz and above. THC concentrates (edibles, vape cartridges, oils): state jail felony minimum for any amount.
Can I be charged with DWI for marijuana in Texas?
Yes — Texas DWI law applies to any impairing substance. THC-DWI follows standard DWI escalation: Class B misdemeanor first offense, Class A second, third-degree felony third+.
Does the hemp defense work in Texas marijuana cases?
Often yes for whole-plant marijuana cases — prosecution must quantitatively confirm Delta-9 THC above 0.3% to prove marijuana. THC concentrate cases not affected; prosecution proceeds on different statutory basis.
